1.NounA young child (typically between one and three years old) who has started walking but not fully mastered it.
"I can't believe Vanessa's baby is now a toddler already!"
2.NounOne unsteady on their feet.
3.NounAny young child (typically before preadolescence) who is capable of walking.
"Toddlers & Tiaras; He gave up, said the sixes were being too rowdy... Can't believe he's scared of literal toddlers!; (The addition of quotations indicative of this usage is being sought:)"