babe vs nurseling

babe and nurseling both are nouns.

Word	Noun	Adjective	Verb	Adverb
babe	Yes	No	No	No
nurseling	Yes	No	No	No

As nouns, nurseling is a hyponym of babe; that is, nurseling is a word with a more specific, narrower meaning than babe:

babe: a very young child (birth to 1 year) who has not yet begun to walk or talk
nurseling: an infant considered in relation to its nurse

babe (noun)	nurseling (noun)
a very young child (birth to 1 year) who has not yet begun to walk or talk	an infant considered in relation to its nurse