The probability of preterm delivery of the second child will be higher for the first child, but it is not absolute, depending on the cause of preterm labor. When preterm labor occurs in the first child, timely consultation should be made to determine the cause of preterm labor in the first child, and actively treat and remove the cause so as not to affect the health of the second child or the mother. If the cause of preterm labor of the first baby is due to factors such as high emotional fluctuation, trauma, inflammation, multiple pregnancies, excessive amniotic fluid, etc., after preventing or eliminating the causes, it usually will not lead to preterm labor of the second baby. On the other hand, if the cause of preterm delivery of the first child is an abnormality in one’s own reproductive system (e.g., uterine abnormality, cervical insufficiency) or pregnancy complications (e.g., high blood pressure in pregnancy, heart disease in pregnancy, gestational diabetes, etc.), the probability of preterm delivery of the second child is indeed a little bit higher.