It is important for babies under 1 year old to receive adequate nutrition, including milk. If your baby is refusing milk during the day, you can try offering it in different ways, such as in a cup or mixed into foods like soup or cereal. It may also be helpful to consult with your pediatrician for advice on how to ensure your baby is getting the nutrients they need. Additionally, if your baby tolerates other dairy products well, incorporating those into their diet could also provide important nutrients.