4
introductory(adjective, beginning, opening, original, authentic)
4
lad(noun, child, youth, juvenile, youngster)
4
lass(noun, child, youngster, teenager, toddler)
4
nestling
4
primeval(adjective, beginning, authentic, first, previous)
3
babe in arms(noun, expression, idiom, baby, child)
3
babyish
3
brat
3
early(adjective, beginning, opening, original, authentic)
3
fetal(adjective, beginning)
3
fledgling(noun, youngster)
3
formative(adjective, beginning)
3
fundamental(beginning, opening, original, first, primary)
3
godchild(noun, very small baby)
3
inceptive(adjective, beginning, opening, original, authentic)
3
initiatory(adjective, beginning, opening, original, primary)
3
little angel(noun, expression, innocent, minor, bundle)
3
little darling(noun, expression, innocent, minor, bundle)
3
little one(noun, verb, expression, phrasal verb, innocent)
3
new(adjective, beginning, lush, luxuriant, young)
10 years ago|10k views|share |citing 
APASmart Define. (2016). infant thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/infant/thesaurus/synonyms
ChicagoSmart Define. 2016. "infant thesaurus" https://smartdefine.org/infant/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, infant thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/infant/thesaurus/synonyms>.
MLASmart Define. "infant thesaurus" 30 March 2016. Web. 23 September 2026. <https://smartdefine.org/infant/thesaurus/synonyms>