Most babies are born between 38 and 42 weeks of gestation. Babies born before 37 weeks are considered premature. Babies born after 42 weeks are called postmature.
What is the earliest stage of a fetus?
After conception, your baby begins a period of dramatic change known as the embryonic stage. This stage runs from the 5th through the 10th week of pregnancy. During this stage, the baby is called an embryo.
How do you calculate gestational age?
Gestational age is calculated from the first day of the mother's last menstrual period and not from the date of conception.
- Ultrasound. The baby can be measured as early as 5 or 6 weeks after the mother's last menstrual period. ...
- Special Cases. ...
- Estimated Due Date. ...
- Last Menstrual Period.
