It has been clear that overweight and obesity in childhood is associated with onset of puberty at a younger age in girls. For boys, this has been less clear and study results have been variable. One issue is that defining onset of puberty may be more difficult in boys compared with girls. In this volume of The Journal, Chen et al used data from the Boston Birth Cohort Study to evaluate this question. They used age at peak height velocity as a marker of puberty. They found that overweight or obesity from age 2-7 years is associated with earlier onset of puberty in boys as well as in girls. However, those with overweight or obesity at age 2-4 years who became normal weight at age 5-7 had normal timing of puberty. This suggests that interventions to achieve normal weight from age 5-6 years could impact timing of puberty and avoid the deleterious impact of early onset of puberty. Article page 221 ▸ Trajectory of Body Mass Index from Ages 2 to 7 Years and Age at Peak Height Velocity in Boys and GirlsThe Journal of PediatricsVol. 230PreviewTo examine the associations between body mass index (BMI) at 2-4 years and 5-7 years and age at peak height velocity (APHV), an objective measure of pubertal timing, among boys and girls from predominantly racial minorities in the US that have been historically underrepresented in this research topic. Full-Text PDF