toddler

toddler
tod‧dler /ˈtɒdlə $ ˈtɑːdlər/ noun [countable]

a very young child who is just learning to walk
     

THESAURUS

   ▪ baby a very young child who has not yet learned to speak or walk: I sat next to a woman holding a baby.
   ▪ toddler a baby who has learned how to walk: The playground has a special area for toddlers.
   ▪ infant formal a baby or a very young child: The disease is mainly found in infants.
   ▪ little one spoken informal a baby, or a small child up to the age of about three: How old is your little one?
   ▪ young the babies of an animal or bird: Kangaroos carry their young in a pouch.
   ▪ litter a group of baby animals that are born at the same time to the same mother: Our cat has just had a litter of six kittens.