For 28 days old babies, sleeping on their stomachs may cause breathing difficulties or affect gastrointestinal function, so it is not recommended to sleep on their stomachs. A 28-day-old baby is defined as a newborn baby, whose neck muscles are not yet fully developed, and who cannot lift his head well in the lying position, thus easily blocking his nose and mouth by the mattress and compressing his airway, causing breathing difficulties. In addition, 28 days of the newborn’s gastrointestinal immaturity, sleep on the stomach may affect the normal digestion, resulting in gastrointestinal dysfunction, and even lead to diarrhea, vomiting and so on. The newborn period is the period of the baby’s resistance is the worst, need parents special care. For more professional advice on newborn care and nursing, it is recommended to consult your doctor at the neonatology department of your hospital.