The major problem with babies after 2-3 or 5-6 months is that they don’t want to drink milk. This can be probably because their feeding time is not correct or they are not liking the taste of formula food or something else. The problem can happen both with the formula milk and breast feeding or it can happen in either ways. Sometimes baby that feed on breast milk find it difficult to change the feed on formula milk and vice versa, baby don’t go on other food easily because their taste has been tasted the same for the long time. And baby’s that has kept feeding on formula milk find difficult to change their diet on breast milk.
However this problem is sometime due the bottle through which they feed, may be because of the small hole in the nipple so this should keep in mind before buying a bottle. At the same you should keep checking the weight of the bottle as many babies loose weight due to no feeding. The difference in taste of the formula milk also makes the baby to avoid the food so one should buy a formula milk of similar taste.