Preterm babies usually raise their head at 2 months of corrected gestational age. Generally speaking, the earlier the baby is born, the later the baby raises its head, which varies from baby to baby. Preterm babies are babies born between 28-37 weeks of pregnancy. Because the gestational age of preterm babies varies, the corrected gestational age is usually used as the standard for calculating the corrected gestational age. Corrected gestational age is usually calculated by subtracting the number of months the baby was born before the birth from the number of months the baby was born before the birth. For example, a preterm baby born at 32 weeks of gestation is considered to be born 2 months early, so when the baby is 3 months old, the corrected gestational age is 3 months minus 2 months, or 1 month. Therefore, preterm babies usually raise their heads at 2 months of corrected gestational age, and the exact time of headship can be calculated in the way described above.