It depends on the milk you are using. If the milk is packaged, and either sterilized or pasteurized, there is no need to boil it. However, if it is not, you must boil it before giving it to your baby. If you are unsure, boil it just to be on the safe side. Giving raw cow milk for babies can be deadly as it can contain several pathogens. When boiling, ensure you do not boil it for more than 3 minutes, as boiling for too long makes it lose its nutrients