I feel so bad, I have just got so angry and frustrated with 9 month old DS - when changing his nappy he flips over time and time again and will not lie still for even a second, I know this is normal behaviour but it drives me mad!! I just flipped him back over firmly and raised my voice at him, and now I feel like a terrible mum. Has anyone else done this?? Please help me feel less like the worst person in the world :-(