Baby with upset stomach

Charlotte

Last night I made a bottle of formula milk for my month old and he finished it so I poured a ready made carton of formula into the bottle I had just used, later on that night he projectile vomited, and he seemed alright. I know now it was a stupid idea to do that. But this morning he’s had diarrhoea, could that be the cause. He seems to have tummy ache as he can’t settle and won’t feed.