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
Preschool refers to an early-childhood educational class for 3- and 4-year-olds. Many offer a part-time schedule (for example, a few hours a day, two to five times a week) as well as full-day care, but only from September to May. Yet the terms are often used interchangeably.