Every few days put more and more milk and less formula in the bottles so that your child gets used to the taste. 3 How to switch to a new baby formula Seek advice from your pediatrician. How do I know if my baby is getting enough formula.
Your child has a milk allergy.
Once you make the switch give your baby at least a few weeks to get adjusted. Feed your baby this mixture for one day. According to Family Doctor a clear sign that you need to change your babys formula is if they are vomiting after having it. The taste may vary slightly and your baby may balk when you switch but you wont harm her by changing brands.