To determine whether it is normal for a preterm baby to not cry at all, it depends on the specific situation, including the normal situation, if the preterm baby does not cry at all, but eats milk and has normal weight gain and mental condition, this is a physiological phenomenon, and there is no need for special intervention. It may also be due to the symptoms caused by the child’s infection, after the preterm baby suffers from sepsis and other infections will often cause the basic do not cry, and preterm babies are often accompanied by poor milk intake and poor mental health, and some may even have pathological jaundice, which should be timely anti-infective treatment, so as not to aggravate the child’s condition.