There are minor formulation changes being implemented to better align select nutrient levels with human milk levels and achieve manufacturing efficiencies to support continuity of supply. Your baby will continue to receive the appropriate nutrition they require, and these amounts are very minor and do not represent any significant nutritional changes.
When the formula is prepared according to the label instructions, we would expect an infant to accept and tolerate all formats equally. However, each baby is different and must be individually evaluated. Most babies adapt to their new diet within 3-5 days. Your baby's doctor is in the best position to answer your questions about any symptoms your baby may experience.