Your baby should be able to happily switch from the old formula to the new but if you would like to ease the transition, you might prefer to change over gradually. This may allow your little one time to adjust to the new milk.To transition to the new milk gradually you could replace one bottle of your baby’s current milk with one bottle of your baby’s new milk each day, keeping all the other feeds of the previous one. It may be a good idea to introduce the new feed when your little one is not too tired or irritable. Continue this way, increasing the number of feeds with new milk each day until all the feeds are with the new milk.A change in stool consistency/frequency can sometimes happen when infants are starting or switching formula, this is perfectly normal. Also, in addition to stool changes baby can be a little unsettled and also pick up a taste difference with some changes. If you have any questions please contact your healthcare professional or the SMA Careline.