my baby's coming up 4 months old and for the last few weeks (since her 3 month growth spurt)have been giving her formula bottles as top ups aswell as breast feeding. I felt as though she needed more than what I was supplying and her weight gain wasn't brilliant. Now she's gaining well and seems to love her bottle but suffers with very bad stomach aches. She's still being able to go to the toilet though. I thought that it would've only been a few days of this but there seems to be no end, can anyone suggest anything?