3 months pregnant how old is the baby?

In the third month of pregnancy, the baby has begun to enter the second trimester of pregnancy. Generally, the baby's body length is about 9 cm, and the top and bottom length is about 6~7 cm. After identifying the external genitals, you can also preliminarily determine the gender, and the fetal limbs can also move. In the third month of pregnancy, the most critical test is NT test, which is to check the transparent layer of the baby's neck. After doing NT test, you can initially rule out whether the baby has chromosomal abnormalities. The normal thickness of NT is generally within 25 mm. If it exceeds 25 mm, it is recommended to be vigilant. Further non-invasive DNA or Down's screening in the middle of pregnancy is needed to rule out whether the baby has chromosomal abnormalities.