The reason for delaying preterm labor until 34 weeks is that at 34 weeks, the fetus’ lungs are almost fully developed and the chances of survival are higher. If there are signs of preterm labor before the 34th week of pregnancy, try to keep the fetus in labor until after the 34th week. This is because the lungs are not fully developed before 34 weeks of pregnancy and the baby is not yet able to breathe on its own, so its ability to survive after birth will be reduced. After 34 weeks of pregnancy, the development of lung function is complete, and the development of the fetus’s body functions tends to be perfect, so it can breathe on its own, and its ability to survive after birth will be greater. Fetal lung development is basically completed at 34 weeks of pregnancy, it is easier to adapt to life outside the uterus after preterm labor, after reasonable care, most preterm babies can survive. If preterm labor is unavoidable before 34 weeks, dexamethasone can be injected intramuscularly to promote the maturation of fetal lungs and improve the survival rate of the fetus.