with child vs enceinte

with child and enceinte both are adjectives.

Word	Noun	Adjective	Verb	Adverb
with child	No	Yes	No	No
enceinte	No	Yes	No	No

As adjectives, with child and enceinte are synonyms defined as:

Other synonyms of with child include big, expectant, gravid, great, heavy, large.

with child (adjective)	enceinte (adjective)
in an advanced stage of pregnancy	in an advanced stage of pregnancy