Baby lying down to drink milk has certain hazards, mainly in the following two aspects: First, the baby’s teeth are vulnerable to injury, if lying down to drink milk, the baby’s incisors will be soaked in the milk. The nutrition is more adequate, the baby’s teeth will soon develop out, so drinking milk is very bad for the baby’s teeth, especially after the child falls asleep, the milk left in the mouth will be corrupted and produce bacteria. Over time, teeth may fall out and pulpitis may occur. The probability of choking on the milk is much greater if you drink the milk lying down, whether it is sideways or lying down, compared to holding it will flow longer in the mouth, and it is easy to choke. When babies drink milk lying down, it will increase the chance of abnormal pressure in the middle ear, which will not only affect the baby’s hearing, but also cause certain infectious diseases.