3 weeks old baby always wet the bed at night may be a normal phenomenon, can be relieved by reducing the amount of water consumption at night, if the baby grows to more than 5 weeks old, still always wet the bed at night, it may be hidden spina bifida, enuresis and other diseases caused. It may be a normal phenomenon for a 3-week-old baby to always wet the bed at night, which is caused by the baby’s cerebral cortex not yet fully developed. Parents can alleviate the symptom of the baby always wetting the bed at night by decreasing the amount of water the baby drinks at night, and avoiding giving the baby water-rich foods such as congee and fruit juice at night. If the baby grows to 5 weeks old, still have the symptom of always wetting the bed at night, then we should consider whether the baby suffers from hidden spina bifida, enuresis and other diseases, parents can wake up the baby regularly at night to take the initiative to urinate, can also be treated by surgery. If a 3-week-old baby has the symptom of always wetting the bed at night, it is recommended to consult a doctor in time to find out the cause and ask the doctor to dispose of it.