The maintenance time of sleep regression during baby’s turning period varies from person to person, mainly related to specific reasons and the age stage of the baby, and cannot be generalized. Usually, babies learn to roll over from about 3 months of age, and some of them turn over only at 4-5 months. As the baby’s body develops, it becomes more active during the day and can cry at night to varying degrees, making sleep more difficult. If the baby is 3-4 months old, the sleep regression usually lasts for about 6 weeks; if the baby is 4-5 months old, the sleep regression usually lasts for about 4 weeks. During this period, parents are advised not to be anxious and to give their babies more patience and companionship. During the day, you can practice rolling over with your baby more often, and if necessary, you can take a moderate calcium supplement. In addition, if the baby cries at night with symptoms such as shaking limbs, sweating or shortness of breath, it is recommended to go to the pediatric internal medicine department of a regular hospital for examination and treatment after clarifying the cause.