It is normal for the stretch mark to grow to the chest. Stretch marks appear in the middle of a pregnant woman’s abdomen from the third trimester onward. In early and mid-pregnancy, they are ignored by pregnant women because they are not obvious, but as pregnancy increases, the color of the stretch marks gradually increases, and they tend to be dark brown in the second trimester. Stretch marks appear during pregnancy mainly due to changes in the levels of estrogen and progesterone in the body, as the progesterone and estrogen in the body are in dynamic change, so the stretch marks will also have certain changes. There is no scientific basis for determining the sex of a fetus by the vulva and length of the gestational line, so don’t trust it blindly.