The corrected gestational age for preterm infants is calculated by the formula, corrected age in months = age at birth in months – (40 – actual gestation time in weeks) / 4. Preterm infants are those born at less than 37 weeks of gestation, and their physical and neurological growth and development lag behind those of full-term infants to a certain extent, so corrected gestational age is required for growth and developmental assessment of preterm infants after birth. Subtracting the number of weeks of gestation before preterm labor from 40 weeks of normal gestation is the time of preterm birth, and the corrected age of preterm infants needs to be subtracted from the time of preterm birth, i.e., correcting the gestational age to 40 weeks. Corrected age (months) = age at birth (months) – (40 – actual gestation time (weeks))/4. In general, when comparing length indicators, it is necessary to correct until 40 months after birth, while weight is 24 months and head circumference is 18 months. Parents of preterm babies are advised to take their babies for regular medical check-ups and to consult a specialist if they have doubts about the indicators.