My baby is 6 months old. He was holding his head up on his own at 1 1/2 months old. Sitting up by 4 1/2 months old. He is fully crawling at 6 months old. We have two stairs in our house and he can go right up those with no problems. He also can pull himself up and stand. A little wobbly still but he is just determined. His doctor said by 9 months or sooner he will be walking haha Anyone else have an advanced baby?