Preterm babies are babies born at less than 37 weeks of age. Preterm babies tend to weigh between 1,000 grams and 2,499 grams, have a head circumference of less than 33 centimeters, and a length of less than 47 centimeters. Preterm babies can be born as early as 28 weeks to 29 weeks of pregnancy, the height and weight of preterm babies are smaller than normal babies, at this time the organs are not mature, the body is weak, low immunity, easy to be infected and sick, care is more difficult. At this time, the weight is between 1,000 and 2,499 grams, the head circumference is below 33 centimeters, and the length of the body is below 47 centimeters. It is recommended that pregnant women should have regular checkups during pregnancy, avoid overwork, and ensure adequate sleep to prevent preterm labor. If preterm labor occurs, parents should take good care of their babies and observe their growth status. If any abnormalities occur, they should go to the hospital in time for consultation and treatment under the guidance of doctors.