infantile


infantile (http://definr.com/infantile)

     adj 1: indicating a lack of maturity; "childish tantrums";
            "infantile behavior" [syn: childish]
     2: of or relating to infants or infancy; "infantile paralysis"
     3: being or befitting or characteristic of an infant; "baby
        rabbits" [syn: baby(a), infant(a)]