My 4 month old is breastfed. His grand parents have had to look after him three times. Every time, I have expressed enough milk, but he wont drink it from a bottle (I have tried the 2 different avent bottles and closer to nature). He will drink formula fine from a bottle. The only problem, is that two out of the three times he has had formula, he has spewed up his entire stomach contents plus bile (the first time he had formula, he drunk several bottles over a 24 hour period and was fine). He goes really limp and just wants to sleep. I picked him up both times and took him straight to hospital. The first time it happened, the dr said he just had too much to drink as he didn't know he was full. The second time he only had 20ml and the same thing happened. I know I need to go see a dr, but living in a small country town, its a bit hard to get in. Has this happened to anyone where their baby's belly doesn't agree with formula? What did you try instead?