4 months and counting! The kids are always doing something new at this stage. Campbell is very good at grabbing her feet and ankles. She also has mastered the lifting of the head thing. Tate on the other hand is more advanced in the sitting up skill. Summer Back at church let us borrow her Bumbo and Tate is loving it! It's interesting to have 2 children at the same age. You learn that they do things at different times. Just because they are both 4 months does not mean they learn the same things at the same time. I think Campbell will crawl first, but Tate will probably walk first. Just a guess.