Ds is five and a half months old and I've recently replaced two of his five feeds with bottles of formula (he refused bottles until then) but now he seems disinterested in his breast feeds. Also, the last three nights he's projectile vomited his bedtime breast feed so ends up waking in the early hours hungry. Do you think the puking is because he's getting used to bottles and his tummy isn't coping with the breast milk? Don't want to give up the bottles as it's taken me so long to get him to take them and don't get on particularly well with expressing.