The Collaborative International Dictionary of English v.0.48:
Babyish \Ba"by*ish\, a. Like a baby; childish; puerile; simple. -- Ba"by*ish*ly, adv. -- Ba"by*ish*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
babyish adj 1: characteristic of a baby; "babyish tears and petulance"