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
People call them babies, infants, toddlers, kiddies, and so on with some terms being slangs and not even accepted English words. Of course, all these terms are used to refer to small children, but there is a clear cut difference between just a baby and an infant as infancy is a duration clearly defined by the doctors. It is not that infants are not babies; they are very much small kids we call babies.