obesity: Body Mass Index for adultsEncyclopÃ¦dia Britannica, Inc.Obesity was traditionally defined as an increase in body weight that was greater than 20 percent of an individualâs ideal body weightâthe weight associated with the lowest risk of death, as determined by certain factors, such as age, height, and gender.
Define infancy: early childhood; a beginning or early period of existence; the legal status of an infant â infancy in a sentence early childhood; a beginning or early period of existence; the legal status of an infantâ¦ See the full definition
Puberty is the process of physical maturation from child to adult. Adolescence defines an age group; puberty occurs during adolescence (see see Physical Growth and Sexual Maturation of Adolescents). At puberty, a 2nd growth spurt occurs, affecting boys and girls slightly differently.