42 days postpartum babies go to the hospital physical examination in addition to height, weight, head circumference, chest circumference and other basic checks, but also should check the baby’s nervous system, whether anemia, hearing, thyroid function, fundus of the eye and so on. 1. First of all, find out whether the baby’s height, weight, head circumference, chest circumference and other basic development is in the normal range, if it is in the abnormal range, then you need to feed under the guidance of the doctor. 2. Neurological: according to the baby’s own condition, we can improve the examination of developmental quotient and neuromotor score, which can help to understand the development of the baby’s nervous system. 3. Blood tests: Blood tests can be done to find out if the baby is anemic, and if necessary, iron supplementation can be given to treat the anemia, otherwise it may affect the intellectual development. 4. Hearing screening: If the baby has not passed the hearing screening after birth, it is necessary to repeat the hearing screening after 42 days of birth. 5. Thyroid function: the complete set of thyroid function can be perfected, and if there is congenital hypothyroidism, it is necessary to supplement levothyroxine sodium tablets in time. To avoid affecting the baby’s development. 6. fundus screening: preterm babies are prone to fundus dysplasia, and in severe cases, blindness may occur, so the fundus can be screened under the guidance of the doctor. 42 days of the baby can be under the guidance of the doctor to improve one or more of the above screening, if necessary, according to their own situation to improve other screening, under the guidance of the doctor for targeted treatment.