Here are some crucial milestones to monitor at different ages:
2 Months: Smiles at people, coos, turns head towards sounds. 6 Months: Rolls over, begins to sit without support, responds to own name. 12 Months: Takes a few steps, says "mama" and "dada," waves bye-bye. 24 Months: Begins to run, says sentences with 2-4 words, follows simple instructions.
