Generally speaking, it is good for a baby to sleep face up. This face-up sleeping position can help the baby breathe and exhaust, and prevent the milk from overflowing. But the baby is still young and the bones will be soft. If they sleep on their backs for a long time, they will have stiff necks or tilt their heads.
Therefore, parents can wait until the baby is older and the bones are stronger, so they can sleep on their backs for a long time. But don't stay asleep all night, or the child's body will become numb. Parents are advised to help their baby change his sleeping position every few hours, such as sleeping face up at first, letting the child sleep on his left side after a few hours, and then sleeping on his side after a few hours.
In fact, every baby has his own comfortable sleeping position. As long as he sleeps well, he doesn't have to correct his sleeping position too much. But parents must not let their babies bury their faces in pillows or sleep under quilts. It will be difficult for the baby to breathe fresh air when sleeping like this, which will lead to suffocation in severe cases.