This document outlines typical speech and language development milestones from birth to 2 years of age. It notes that newborns can localize sounds and begin to smile by 1 month. Between 3-6 months, infants can imitate sounds, and between 4-8 months they begin babbling with isolated sounds. Comprehension of words emerges around 6-10 months, and the first words other than "mama" or "dada" are usually spoken between 9-14 months. By 18-22 months, children use two-word phrases or sentences.