At what age does normal, healthy babies start walking? My niece's baby started walking at 9 months but my other niece's baby is 10 months old and still only crawls. My nieces are sisters and the babies are 3 weeks apart in age. the younger baby came a month early and still don't walk yet and my niece is worried her baby is a little slow. Her baby don't have as many teeth, don't talk or do things that her cousin does yet or weigh as much. But then she only weighed 4 lbs and something at birth. Does being premature factor in on child development that late or is she still like in a "normal" range? Is there some kind of baby development chart on the web somewhere about what is normal range?