Many specialized formulas (like those for CMPA) have a bitter or unpleasant taste that babies may reject initially. Persistence is key—continue offering it at different times of the day, particularly when the baby is sleepy, as they are often more willing to accept new tastes then. Some parents find success by adding a small amount of fennel (saunf) water to the formula to help with digestion and mask the taste, but always check with your pediatrician before adding anything to the feed. Avoid adding sugar, as it is not recommended for infants under two.