A preterm baby is a newborn whose gestational week is less than 37 weeks.The discharge time for a 33-week preterm baby varies depending on the development of the preterm baby. If the development is good, the baby can be discharged after about a month of observation in the incubator. Since the development of all organs in the body of a preterm baby is not as perfect as that of a full-term baby, it is important to observe the preterm baby closely after birth, such as observing the preterm baby’s breathing and feeding. If the lungs of a 33-week preterm baby are well developed and can breathe normally, eat normally, have satisfactory weight gain, and there are no other complications, the baby can be discharged from the hospital after about one month of observation in the incubator. If the development is not good, the time will be extended accordingly. However, if the 33-week preterm baby cannot eat normally, has weak respiratory capacity, or shows signs of pneumonia, further examination and treatment in the hospital and active care are required.