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

indicating a lack of maturity; "childish tantrums"; "infantile behavior"

of or relating to infants or infancy; "infantile paralysis"

(kink) Those who enjoy the use of baby-associated items as fetishes or items of arousal, often diapers, bibs, pacifiers, bonnets and the like. Sometimes related with watersports and scat.

being or befitting or characteristic of an infant; "infantile games"

the period in an individual's life cycle from birth to the eruption of the first permanent teeth.