Level 1: What are the reasons why babies eat less milk? Your baby\’s lack of milk intake may be due to a variety of reasons, including oral problems, digestive issues, infections, and more. The most common reasons are nipple pain, breast siltation, insufficient milk supply, etc. If your baby is eating less milk, you should first determine the cause and take appropriate measures. Level 2: How to increase baby’s appetite? If your baby is eating less milk, you can try the following methods to increase his/her food intake: