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
-Â·cies. 1  the state or period of being an infant; babyhood; very early childhood. 2  the beginning or earliest stage of anything. 3  Law the state or period of being a minor; period before the age of legal majority, usually eighteen; minority.