babe vs suckling

babe and suckling both are nouns.

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

As nouns, suckling is a hyponym of babe; that is, suckling 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
suckling: an infant considered in relation to its nurse

babe (noun)	suckling (noun)
a very young child (birth to 1 year) who has not yet begun to walk or talk	feeding an infant by giving suck at the breast
	a young mammal that has not been weaned
	an infant considered in relation to its nurse