This document outlines typical baby development milestones in 3 month intervals from 1 to 18 months. Key milestones include cooing and smiling in the first 3 months, grasping things and teething from 4 to 6 months, crawling and sitting unsupported from 7 to 9 months, standing alone and understanding a few words from 10 to 12 months, running, using words, and responding to instructions from 13 to 15 months, and dancing, climbing, and using a few words regularly from 16 to 18 months. Contact information is provided at the end.