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Faster gains in weight, length or height, or body mass index in the first 5 years of life were associated with an earlier onset of puberty in boys and girls, based on data from a cohort study of more than 7,000 children.
In recent decades, clinicians and parents have raised concerns about an earlier onset of puberty in children in the United States and other countries, Izzudin M. Aris, PhD, of Harvard Medical School, Boston, and colleagues wrote.
“Children with earlier pubertal onset not only may be at increased risk for long-term chronic diseases, but also may experience adverse consequences during adolescence, including psychosocial difficulties and dysmetabolism,” they said. However, the effect of growth in the first 5 years of life on pubertal onset has not been well studied.
In a study published in JAMA Network Open, the researchers identified 7,495 children from 36 cohorts participating in the Environmental Influences on Child Health Outcomes program from Jan. 1, 1986, to Dec. 31, 2015.
The study population included 3,772 girls and 3,723 boys; 60% reported as White, 23% as Black, 15% as Hispanic, 12% as one of the following: American Indian or Alaska Native, Native Hawaiian or Pacific Islander, multiple races, or other race. Most (84.1%) were born during or after the year 2000.
The primary outcome was the pubertal growth spurt, also known as age at peak height velocity (APHV). The researchers measured growth at 3 age periods in the first 5 years (early infancy, late infancy, and early childhood) and estimated rates of weight, length or height, and body mass index (BMI) gain. Secondary outcomes included self-reported pubic hair staging and scores on the Pubertal Development Scale.
Overall, weight and length or height gain velocities declined in the first 5 years of life, and boys had faster gains in early infancy, compared with girls.
APHV was negatively correlated with puberty scores and Tanner staging for pubic hair development in both boys and girls, while puberty score was positively correlated with Tanner staging for pubic hair in both sexes.
After controlling for maternal and child confounders including maternal age at delivery, maternal education level, and year of birth, faster gains in weight, length or height, or BMI at each of the three measurement periods in early life was associated with earlier APHV in boys. No effect was noted for race, maternal education level, or birth year.
In girls, faster gains in weight, length, or height, only at the latest measurement period (early childhood) were associated with younger APHV. No associations with APHV occurred for velocities of BMI gain at any age period in girls, the researchers noted. However, age at menarche was positively correlated with early APHV and negatively correlated with puberty score and Tanner staging for pubic hair.
The findings support previous studies of associations between child growth and pubertal onset, the researchers wrote. The mechanisms of action are many, and have not been explained, the researchers wrote in their discussion of the findings.
“We speculate that insulinlike growth factor 1 may be a factor in the associations observed in the present study, either directly or indirectly through sex steroid synthesis and secretion. Alternatively, in girls, androgens and adipokines may be factors in the observed associations for pubic hair staging and menarche, respectively,” they said. Genetics and other factors including social factors, environmental exposures, diet, and physical activity also affect growth in early life.
The study findings were limited by several factors including the use of child-reported measures of pubic hair staging and parent reports of pubertal scores, with the potential for error and misclassification, the researchers noted. Other limitations include a lack of data on maternal age at menarche and the use of weight-for-length rather than BMI for children younger than 2 years.
However, the results were strengthened by the large sample size, long-term follow-up, and especially the use of a nationally representative contemporary cohort that addresses gaps in the current literature from later time periods. The results support the associations of sex-specific early pubertal onset in children with faster growth early in life. “In the long term, results of the present study may inform future research that aims to develop and/or test preventive interventions to optimize nutrition, environmental exposures, physical activity, and other behaviors related to growth during these age periods,” they concluded.
Time and timing limit practical application of results
The current study addresses two issues that are ongoing concerns for clinicians, specifically, the rise in obesity in childhood and its potential link to an earlier age of entry into puberty, M. Susan Jay, MD, of the Medical College of Wisconsin, Milwaukee, said in an interview.
“Authors in prior studies have suggested that earlier puberty, and indeed earlier menarche, in females may be associated with the potential of long-term health issues,” Dr. Jay noted. “It has also been suggested that both early maturing females and males may be impacted psychosocially. Others have suggested that the pathways through puberty are key and environmental factors as well as nutrition can have an impact on adolescence as well as health consequences later in life.”
The current study is important because it focused on children born in the present era of the obesity epidemic, while earlier studies were conducted on a group in the 1960s-1980s. “This study suggests that there are sex-specific associations of faster growth and earlier entry into puberty,” Dr. Jay said.
“While it is exciting to consider closer monitoring of pubertal progression in pediatric settings, often patients and families do not present in a timely manner for assessment,” she said. “Also, the authors suggest that preventive support may be offered to children who are traversing puberty at earlier ages. However, given the current stress on practices with COVID as well as stress on providers offering clinical services, identifying supportive interventions may be a stretch at best for practitioners already burdened by clinical and administrative demands.
“Ongoing studies are needed to address the knowledge gaps that exist in the arena of pubertal onset and growth during childhood across life periods,” said Dr. Jay. “In the long term, the present study may help direct research that could focus on preventive interventions to optimize nutrition, physical activity, environmental exposures, and other factors that intersect growth during infancy through early childhood, which may hasten early pubertal development’s later sequelae in adulthood.”
The study was supported by various grants to the researchers from the Environmental Influences on Child Health Outcomes program, Office of the Director, National Institutes of Health, as well as the Colorado Clinical and Translational Sciences Institute, University of Colorado at Denver. Lead author Dr. Aris had no financial conflicts to disclose. Dr. Jay had no conflicts to disclose and serves on the editorial advisory board of Pediatric News.
Faster gains in weight, length or height, or body mass index in the first 5 years of life were associated with an earlier onset of puberty in boys and girls, based on data from a cohort study of more than 7,000 children.
In recent decades, clinicians and parents have raised concerns about an earlier onset of puberty in children in the United States and other countries, Izzudin M. Aris, PhD, of Harvard Medical School, Boston, and colleagues wrote.
“Children with earlier pubertal onset not only may be at increased risk for long-term chronic diseases, but also may experience adverse consequences during adolescence, including psychosocial difficulties and dysmetabolism,” they said. However, the effect of growth in the first 5 years of life on pubertal onset has not been well studied.
In a study published in JAMA Network Open, the researchers identified 7,495 children from 36 cohorts participating in the Environmental Influences on Child Health Outcomes program from Jan. 1, 1986, to Dec. 31, 2015.
The study population included 3,772 girls and 3,723 boys; 60% reported as White, 23% as Black, 15% as Hispanic, 12% as one of the following: American Indian or Alaska Native, Native Hawaiian or Pacific Islander, multiple races, or other race. Most (84.1%) were born during or after the year 2000.
The primary outcome was the pubertal growth spurt, also known as age at peak height velocity (APHV). The researchers measured growth at 3 age periods in the first 5 years (early infancy, late infancy, and early childhood) and estimated rates of weight, length or height, and body mass index (BMI) gain. Secondary outcomes included self-reported pubic hair staging and scores on the Pubertal Development Scale.
Overall, weight and length or height gain velocities declined in the first 5 years of life, and boys had faster gains in early infancy, compared with girls.
APHV was negatively correlated with puberty scores and Tanner staging for pubic hair development in both boys and girls, while puberty score was positively correlated with Tanner staging for pubic hair in both sexes.
After controlling for maternal and child confounders including maternal age at delivery, maternal education level, and year of birth, faster gains in weight, length or height, or BMI at each of the three measurement periods in early life was associated with earlier APHV in boys. No effect was noted for race, maternal education level, or birth year.
In girls, faster gains in weight, length, or height, only at the latest measurement period (early childhood) were associated with younger APHV. No associations with APHV occurred for velocities of BMI gain at any age period in girls, the researchers noted. However, age at menarche was positively correlated with early APHV and negatively correlated with puberty score and Tanner staging for pubic hair.
The findings support previous studies of associations between child growth and pubertal onset, the researchers wrote. The mechanisms of action are many, and have not been explained, the researchers wrote in their discussion of the findings.
“We speculate that insulinlike growth factor 1 may be a factor in the associations observed in the present study, either directly or indirectly through sex steroid synthesis and secretion. Alternatively, in girls, androgens and adipokines may be factors in the observed associations for pubic hair staging and menarche, respectively,” they said. Genetics and other factors including social factors, environmental exposures, diet, and physical activity also affect growth in early life.
The study findings were limited by several factors including the use of child-reported measures of pubic hair staging and parent reports of pubertal scores, with the potential for error and misclassification, the researchers noted. Other limitations include a lack of data on maternal age at menarche and the use of weight-for-length rather than BMI for children younger than 2 years.
However, the results were strengthened by the large sample size, long-term follow-up, and especially the use of a nationally representative contemporary cohort that addresses gaps in the current literature from later time periods. The results support the associations of sex-specific early pubertal onset in children with faster growth early in life. “In the long term, results of the present study may inform future research that aims to develop and/or test preventive interventions to optimize nutrition, environmental exposures, physical activity, and other behaviors related to growth during these age periods,” they concluded.
Time and timing limit practical application of results
The current study addresses two issues that are ongoing concerns for clinicians, specifically, the rise in obesity in childhood and its potential link to an earlier age of entry into puberty, M. Susan Jay, MD, of the Medical College of Wisconsin, Milwaukee, said in an interview.
“Authors in prior studies have suggested that earlier puberty, and indeed earlier menarche, in females may be associated with the potential of long-term health issues,” Dr. Jay noted. “It has also been suggested that both early maturing females and males may be impacted psychosocially. Others have suggested that the pathways through puberty are key and environmental factors as well as nutrition can have an impact on adolescence as well as health consequences later in life.”
The current study is important because it focused on children born in the present era of the obesity epidemic, while earlier studies were conducted on a group in the 1960s-1980s. “This study suggests that there are sex-specific associations of faster growth and earlier entry into puberty,” Dr. Jay said.
“While it is exciting to consider closer monitoring of pubertal progression in pediatric settings, often patients and families do not present in a timely manner for assessment,” she said. “Also, the authors suggest that preventive support may be offered to children who are traversing puberty at earlier ages. However, given the current stress on practices with COVID as well as stress on providers offering clinical services, identifying supportive interventions may be a stretch at best for practitioners already burdened by clinical and administrative demands.
“Ongoing studies are needed to address the knowledge gaps that exist in the arena of pubertal onset and growth during childhood across life periods,” said Dr. Jay. “In the long term, the present study may help direct research that could focus on preventive interventions to optimize nutrition, physical activity, environmental exposures, and other factors that intersect growth during infancy through early childhood, which may hasten early pubertal development’s later sequelae in adulthood.”
The study was supported by various grants to the researchers from the Environmental Influences on Child Health Outcomes program, Office of the Director, National Institutes of Health, as well as the Colorado Clinical and Translational Sciences Institute, University of Colorado at Denver. Lead author Dr. Aris had no financial conflicts to disclose. Dr. Jay had no conflicts to disclose and serves on the editorial advisory board of Pediatric News.
Faster gains in weight, length or height, or body mass index in the first 5 years of life were associated with an earlier onset of puberty in boys and girls, based on data from a cohort study of more than 7,000 children.
In recent decades, clinicians and parents have raised concerns about an earlier onset of puberty in children in the United States and other countries, Izzudin M. Aris, PhD, of Harvard Medical School, Boston, and colleagues wrote.
“Children with earlier pubertal onset not only may be at increased risk for long-term chronic diseases, but also may experience adverse consequences during adolescence, including psychosocial difficulties and dysmetabolism,” they said. However, the effect of growth in the first 5 years of life on pubertal onset has not been well studied.
In a study published in JAMA Network Open, the researchers identified 7,495 children from 36 cohorts participating in the Environmental Influences on Child Health Outcomes program from Jan. 1, 1986, to Dec. 31, 2015.
The study population included 3,772 girls and 3,723 boys; 60% reported as White, 23% as Black, 15% as Hispanic, 12% as one of the following: American Indian or Alaska Native, Native Hawaiian or Pacific Islander, multiple races, or other race. Most (84.1%) were born during or after the year 2000.
The primary outcome was the pubertal growth spurt, also known as age at peak height velocity (APHV). The researchers measured growth at 3 age periods in the first 5 years (early infancy, late infancy, and early childhood) and estimated rates of weight, length or height, and body mass index (BMI) gain. Secondary outcomes included self-reported pubic hair staging and scores on the Pubertal Development Scale.
Overall, weight and length or height gain velocities declined in the first 5 years of life, and boys had faster gains in early infancy, compared with girls.
APHV was negatively correlated with puberty scores and Tanner staging for pubic hair development in both boys and girls, while puberty score was positively correlated with Tanner staging for pubic hair in both sexes.
After controlling for maternal and child confounders including maternal age at delivery, maternal education level, and year of birth, faster gains in weight, length or height, or BMI at each of the three measurement periods in early life was associated with earlier APHV in boys. No effect was noted for race, maternal education level, or birth year.
In girls, faster gains in weight, length, or height, only at the latest measurement period (early childhood) were associated with younger APHV. No associations with APHV occurred for velocities of BMI gain at any age period in girls, the researchers noted. However, age at menarche was positively correlated with early APHV and negatively correlated with puberty score and Tanner staging for pubic hair.
The findings support previous studies of associations between child growth and pubertal onset, the researchers wrote. The mechanisms of action are many, and have not been explained, the researchers wrote in their discussion of the findings.
“We speculate that insulinlike growth factor 1 may be a factor in the associations observed in the present study, either directly or indirectly through sex steroid synthesis and secretion. Alternatively, in girls, androgens and adipokines may be factors in the observed associations for pubic hair staging and menarche, respectively,” they said. Genetics and other factors including social factors, environmental exposures, diet, and physical activity also affect growth in early life.
The study findings were limited by several factors including the use of child-reported measures of pubic hair staging and parent reports of pubertal scores, with the potential for error and misclassification, the researchers noted. Other limitations include a lack of data on maternal age at menarche and the use of weight-for-length rather than BMI for children younger than 2 years.
However, the results were strengthened by the large sample size, long-term follow-up, and especially the use of a nationally representative contemporary cohort that addresses gaps in the current literature from later time periods. The results support the associations of sex-specific early pubertal onset in children with faster growth early in life. “In the long term, results of the present study may inform future research that aims to develop and/or test preventive interventions to optimize nutrition, environmental exposures, physical activity, and other behaviors related to growth during these age periods,” they concluded.
Time and timing limit practical application of results
The current study addresses two issues that are ongoing concerns for clinicians, specifically, the rise in obesity in childhood and its potential link to an earlier age of entry into puberty, M. Susan Jay, MD, of the Medical College of Wisconsin, Milwaukee, said in an interview.
“Authors in prior studies have suggested that earlier puberty, and indeed earlier menarche, in females may be associated with the potential of long-term health issues,” Dr. Jay noted. “It has also been suggested that both early maturing females and males may be impacted psychosocially. Others have suggested that the pathways through puberty are key and environmental factors as well as nutrition can have an impact on adolescence as well as health consequences later in life.”
The current study is important because it focused on children born in the present era of the obesity epidemic, while earlier studies were conducted on a group in the 1960s-1980s. “This study suggests that there are sex-specific associations of faster growth and earlier entry into puberty,” Dr. Jay said.
“While it is exciting to consider closer monitoring of pubertal progression in pediatric settings, often patients and families do not present in a timely manner for assessment,” she said. “Also, the authors suggest that preventive support may be offered to children who are traversing puberty at earlier ages. However, given the current stress on practices with COVID as well as stress on providers offering clinical services, identifying supportive interventions may be a stretch at best for practitioners already burdened by clinical and administrative demands.
“Ongoing studies are needed to address the knowledge gaps that exist in the arena of pubertal onset and growth during childhood across life periods,” said Dr. Jay. “In the long term, the present study may help direct research that could focus on preventive interventions to optimize nutrition, physical activity, environmental exposures, and other factors that intersect growth during infancy through early childhood, which may hasten early pubertal development’s later sequelae in adulthood.”
The study was supported by various grants to the researchers from the Environmental Influences on Child Health Outcomes program, Office of the Director, National Institutes of Health, as well as the Colorado Clinical and Translational Sciences Institute, University of Colorado at Denver. Lead author Dr. Aris had no financial conflicts to disclose. Dr. Jay had no conflicts to disclose and serves on the editorial advisory board of Pediatric News.
FROM JAMA NETWORK OPEN