How long a 33-week preterm baby stays in the warm box depends on the growth and development of the preterm baby, and it may take only about 2 weeks for the short ones or up to 1 month for the long ones. Premature babies are divided into different periods according to the time of prematurity. 33 weeks belongs to the middle term prematurity, and the length of time required in the warm box should be judged comprehensively according to the treatment and recovery. 33 weeks fetal lungs and organs are not yet developed, and the weight is usually around 1-1.5 kg. In general, 33-week preterm infants should be corrected for gestational age up to 36 weeks so that their weight is higher than 2.0 kg. If the preterm infant can breathe spontaneously after birth, no ventilator is needed and hospitalization may be sufficient for about 2 weeks. If the preterm infant is born with a low Apgar score, he or she will need to be in the incubator for a relatively long time, possibly up to 1 month or even 2 months. When the preterm infant’s vital signs are more stable, such as stable breathing, heart rate and normal body temperature, he or she can be removed from the incubator. In addition, parents need to take care of their 33-week-old preterm babies with intensive daily care and keep an eye on their breathing, feeding, urination and defecation.