She's been crying a lot after feeds, i think she might be constipated thought, she is going maybe 36hours without a poo and looks quite often like she is trying to go but nothing then when she does it is diarrhoea and she screams the place down. She also get quite windy. Wasn't sure about changing teats as the next 1 up would be level 3 for 6 months +
I know some people don't like avent bottles at all. Or possibly its the milk?