Infantile

a.

1.

Of or pertaining to infancy, or to an infant; similar to, or characteristic of, an infant; childish; as, infantile behavior.

Adj.	1.	infantile - indicating a lack of maturity; "childish tantrums"; "infantile behavior" Synonyms: childish
	2.	infantile - of or relating to infants or infancy; "infantile paralysis"
	3.	infantile - being or befitting or characteristic of an infant; "infantile games"

abecedarian, aboriginal, antenatal, autochthonous, babish, baby, beginning, budding, childish, childlike, creative, doll-like, dollish, elemental, elementary, embryonic, fetal, formative, foundational, fundamental, gestatory, in arms, in diapers, in embryo, in its infancy, in nappies, in swaddling clothes, in the bud, in the cradle, inaugural, inceptive, inchoate, inchoative, incipient, incunabular, infant, infantine, initial, initiative, initiatory, introductory, inventive, juvenile, kittenish, nascent, natal, neonatal, newborn, original, parturient, postnatal, pregnant, prenatal, primal, primary, prime, primeval, primitive, primogenial, procreative, puerile, rudimental, rudimentary, ur