the.com/tot

means A very young child, especially one just learning to walk and talk.

from Tot popped up in English around the 1500s as a casual word for a small child or a small drinking cup — the two senses may be related, since both describe something small. Nobody is fully certain of the deeper root, though it's possibly linked to Scandinavian words for a stunted or dwarfish thing (compare Old Norse 'tottr', the nickname of a dwarf). The sense of 'tiny amount' in 'tot up a small sum' or a 'tot of whisky' springs from that same seed of smallness.