Is it good for a baby to drink both formula milk and breast milk?

Patient's question:

No

Doctor's answer:

Hello, when combining breastfeeding with formula feeding, you can start by feeding your child breast milk each time. If it's not enough, you can then give them some formula or other substitutes.
Here are the specific methods:
Method 1:
Each time you feed, start with breast milk and feed from both breasts to ensure the child fully empties them. If they are still hungry, use a small spoon to give them some formula. Note that the formula should be prepared according to the child's age, and the amount should be just enough to satisfy their hunger—don't overfeed to avoid causing vomiting.
Method 2:
During the day, give your child a few feedings of formula or other substitutes, while continuing to breastfeed at other times. For example, breastfeed at 8 a.m., then give formula at 11 a.m., and breastfeed again at the next feeding. When giving formula or other substitutes, prepare it according to the child's age and feed them slowly with a spoon.
Do not overfeed the child with formula—ideally, it should not exceed half of their total feedings, otherwise, it may lead to failure in breastfeeding.