DD is nearly 6 weeks old, after every feeding she gets really uncomfortable and looks as if she is straining to poo. I'm fairly certain she isn't constipated as her poo is normal (if baby poo can ever be called normal!) and she poo's at least once a day normally. Its starting to wake her during the day naps and she seems torn between wanting more food and being almost in pain with her tummy. Any advice on how to help her?