By definition, a “toddler” is one who toddles or, in this case, a very small child who toddles. “Toddling”, of course, is the
word we use to describe the initial method that small children undertake in order to move from place to place. Therefore, a “toddler” is an infant who has begun to walk. This is the first developmental milestone of toddlerhood and usually occurs somewhere between 11 months and 15 months of age.