AGA full form in medical is Appropriate for gestational age. Gestation age simply means or indicates the age of pregnancy in a woman, which starts from the last menstrual cycle to the delivery day. The gestational age can be anywhere between 25 weeks to 42 weeks. However, the most usual or normal gestational age is around 38 weeks to 42 weeks, and if a baby is born as per the normal gestational age, there are chances that the baby will be healthy and fit.
Well, you may be wondering how a medical professional determines the AGA or simply the gestational age. Right? That is only possible because of advanced imaging methods like Ultrasound, which can give a clear real-time picture of a baby inside the womb to medical professionals. And by looking at the premature fetus or baby, medical professionals can easily determine the gestational age and some other characteristics. For that, they primarily look at the size of the head, thigh bone, overall weight, and abdominal region. Other things like reflexes, posture, skin, and hair growth can also help doctors determine gestational age.