Examined 2-year-olds' comprehension and production of novel nouns, verbs, or actions at 3 intervals after training conducted in massed or distributed exposures. Found that for comprehension, children learned all item types in all training conditions at all retention intervals. Production was better for nonverbal actions than for either word type and following distributed versus massed exposure. Children produced more new nouns than verbs. Retention interval did not affect production. (Author/KB)