Babies with milk allergies often exhibit behaviors such as frequent crying, irritability, and fussiness, especially during or after feedings. They may experience digestive issues like vomiting, diarrhea, or gas, and skin reactions such as rashes or eczema. Sleep disturbances and feeding aversions are also common. To manage these symptoms, hypoallergenic formulas like Aptamil Pepti is often recommended, as they are specially formulated for babies with milk protein allergies.