when do stretch marks appear in pregnancy

Stretch marks in pregnancy most commonly appear around the 6th to 7th month (approximately the start of the third trimester), as the abdomen and breasts expand and the skin stretches rapidly. This typically corresponds to around the 24th to 30th week of gestation. Some women may notice early signs such as itching or skin thinning even earlier, around the second trimester or near the 30th week. The appearance and timing can vary depending on factors like skin type, genetics, weight gain speed, and hormonal changes. Stretch marks usually develop on the belly, breasts, hips, thighs, and buttocks. Their color initially may be red, purple, or pink and then fade to lighter shades after delivery.