hi my 6 week old girl is constantly upset and hungry,she gags when having her feed and has had really runny poo for a couple weeks now,she also has a rash round her mouth and sounds ruckely and snotty after her feeds.i tried infocol and give her aired water each day.also she is having around 6-7 ounce every 3 hours but crys and arches her back each time?