My sister’s baby (non-cah) is a big baby. At 10 mo old she was about 23 lbs and 30 in. Her milestones seem slightly delayed. She didn’t crawl until about 9-10 months, and finally at 11 months she is starting to pull up. This seems slow to me as my babies walked at 9 and 12 months. I think her size may have something to do with it. It is harder to support more weight.