It is not recommended that the baby in the month sleep on his back. No baby has just finished nursing, and Bao Xiao's internal organs are not fully developed. His esophageal cavity is quite long, which is also because of his December spring tide, which has not developed at all. Therefore, if Bao Xiao sleeps on his back, he will easily vomit milk and choke. It is easy to choke him and grab his nose, so it is still recommended. Bao Xiao had better sleep on his side, so if he vomits, it won't have much influence on the children.