WordNet sense 1 (an immature childish person):

child

WordNet sense 2 (a very young child (birth to 1 year) who has not yet begun to walk or talk):

infant

WordNet sense 3 ((slang) sometimes used as a term of address for attractive young women):

sister

WordNet sense 4 (treat with excessive indulgence):

coddle, cosset, indulge, mollycoddle, pamper, spoil, cocker, featherbed