Hi there. We just started solid foods at almost exactly 5 months. I wanted to wait until as close to 6 months as possible. Until that point, breast milk was completely satisfying to her, so I thought no point in trying. Suddenly, no matter how much I tried to increase my supply, dd started waking a lot, especially early AM and naps went down the drain. She wanted to eat every 3 hours again. Also, she is about 18 pounds at five months, so physically fairly 'mature'. These were clear signs she was needing more nourishment during the day. Since we began solids (only interested in bananas) sleep has vastly improved. Due to your lo's tummy troubles, I would suspect solids are a factor. My dd also wakes at night (usually around 2am with some gas that is remedied with a pick up and snug hold belly to belly) which has started with solids, so I'm sure it will take some time for her digestive system to adjust. She also has some teething symptoms recently that made for a terrible night or two. I jsut made sure I stuck with a consistent response and things will improve for a day or two before new symptoms appear. Nice to know others have similar experiences!