the time when a baby is developing inside its mother before it is born

gestation means the period of time a baby is carried in the uterus. This is counted from the first day of your last menstrual period. Early-term gestation is between 37 to 39 weeks; full-term gestation is between 37 and 41 weeks; late-term gestation is between 41 and 42 weeks; and post-term gestation is 42 weeks or more