Stretch marks may be induced if a woman has no stretch marks with her first pregnancy, but is overweight or has an excessively large fetus with her second pregnancy. If a pregnant woman carries her second child with proper weight gain and proper size of the fetus, she may not have stretch marks. Stretch marks are mainly caused by hormonal changes in the pregnant woman’s body during pregnancy resulting in stretching of the subcutaneous tissue, which destroys collagen fibers, elastin fibers, and connective tissues of the dermis, which can lead to the appearance of purple or pink stripes on the skin. If a woman does not have stretch marks when she is pregnant with her first child, whether she will develop stretch marks when she is pregnant with her second child needs to be determined by her own situation. If a woman did not have stretch marks with her first child, but gained too much weight with her second child and her newborn baby was too heavy, stretch marks may appear on her abdomen. If a woman has a slow weight gain with her second child and the baby has normal weight gain, stretch marks may not appear. Therefore, if a woman has no stretch marks with her first child, she needs to control her weight with her second child.