my 4.5 mth is EBF. trying to train him to take a cup for when i go back to work. I gave him 1 ounce of aptimil the other day which he seemed to like. was a bit unsettled that night then next day snotty nose and then did a massive vomit and then really unsettled all night.
Could this be an allegy to formula? Or is it just cos he's not used to it? Will he get used to it/ grow out of it?