1, smaller than gestational age refers to a baby who is less than 37 weeks pregnant (that is, 259 days).

2. gestational age refers to the number of weeks from the first day of pregnancy to the birth of the baby.

3. In general, full-term pregnancy is 40 weeks, premature delivery is less than 40 weeks but more than 37 weeks, and small for gestational age (premature) is less than 37 weeks.

4. According to the gestational age at birth, infants younger than gestational age can be further divided into very premature infants (gestational age less than 28 weeks at birth), extremely immature infants (gestational age 28-3 1 week at birth) and immature infants (gestational age 32-36 weeks at birth).

Babies younger than gestational age need special care and attention, because their organs and systems are not fully developed at birth and need extra support and care.

Second, prevent premature birth.

1. Maintain good pre-pregnancy health: ensure good health before planning pregnancy, including maintaining a healthy weight, regular physical examination, balanced diet, proper exercise and avoiding contact with harmful substances.

2. Pay attention to nutrition intake: During pregnancy, especially in the first three months, it is very important to ensure adequate nutrition for fetal development. Consult a doctor or professional dietitian to ensure a balanced diet, and add appropriate vitamin and mineral supplements according to personal needs during pregnancy.

3. Prevention of infection: Infection is one of the common causes of premature delivery, so it is very important to prevent infection. Maintain good hygiene habits, wash your hands regularly and properly handle and cook food to avoid contact with patients or infectious diseases.

4. Prevention of overwork and stress: Overwork and constant stress may increase the risk of premature delivery. In order to reduce this risk, try to avoid overwork, maintain a good work-life balance, actively cope with pressure, and seek appropriate support and help.

5. Regular prenatal check-ups and health care during pregnancy: It is very important to receive regular prenatal check-ups and health care during pregnancy. Doctors can monitor the health status of pregnant women and fetuses, provide necessary advice and guidance, and discover any potential risk factors and complications in time.

Third, how to give special care and attention to babies younger than gestational age.

1, organ support and monitoring:

Infants younger than gestational age may need respiratory support, such as mechanical ventilation and respiratory AIDS. At the same time, their vital signs such as heart rate, blood pressure and oxygenation state need to be closely monitored.

2, heat preservation:

Infants younger than gestational age have weak thermoregulation ability and need to maintain appropriate temperature. Use warm environment and heat preservation equipment, such as temperature and humidity box, to keep the baby's body temperature stable.

3, diet and nutrition:

Infants younger than gestational age need to pay special attention to nutrition intake, and give proper breastfeeding or artificial feeding according to the advice of doctors or nutritionists. Sometimes it may be necessary to give nutritional supplements through pipelines or intravenous routes.