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
Definition of Youth 1. the condition of being young.2. the appearance, freshness, vigor, spirit, etc., characteristic of one who is young. 3. the time of being young; early life: His youth was spent on the farm. 4. the period of life from puberty to the attainment of full growth; adolescence.