Your 28-week-old baby is now seven months old, enjoying his understanding, learning to crawl and maybe even starting to sit up. Some babies may already be standing up to walk, while others are still happily rolling around to get where they want to go. These are all normal changes in baby development. Your 28-week-old's little brain is also working hard, developing rapidly to help him stand upright and walk in the coming months. You may notice a change in appetite, changes in sleeping habits and crying times, and he's starting to develop new skills. In this article, we'll give you some useful information about your 28-week-old baby's development after birth.