Stretch Marks at 21 Weeks Pregnant
Stretch marks (striae gravidarum) are very common in pregnancy, affecting up to 90% of women. They occur when the skin stretches faster than it can accommodate, causing small tears in the dermis.
👶 What's Happening at Week 21
Your baby is now the size of a carrot.
- The fetus is swallowing amniotic fluid and absorbing nutrients.
- Bone marrow is now producing blood cells.
- Small intestine begins absorbing sugars.
🔬 Why You're Experiencing Stretch Marks at Week 21
- Rapid skin stretching over the abdomen, breasts, hips, and thighs
- Genetic predisposition — if your mother had stretch marks, you likely will too
- Higher cortisol levels in pregnancy may reduce skin elasticity
- Rapid weight gain
- Skin type — fair skin may show stretch marks more prominently
💊 Relief Tips for Week 21
📋 Other Week 21 Symptoms
⚠️ Call Your Doctor If…
- Stretch marks that are intensely itchy and accompanied by a rash (possible PUPPP — pruritic urticarial papules and plaques of pregnancy)
- Sudden, extremely itchy stretch marks on the abdomen late in pregnancy
- Skin that is cracking or breaking open
Frequently Asked Questions
Can you prevent stretch marks during pregnancy?
Genetics play the biggest role, so complete prevention isn't possible. However, keeping skin moisturized and gaining weight gradually may minimize their extent.
Do stretch marks fade after pregnancy?
Yes — stretch marks are often red or purple initially and fade to silver, white, or skin-toned within 6–12 months postpartum. They rarely disappear entirely.
Where do stretch marks appear in pregnancy?
Most commonly on the abdomen, breasts, hips, thighs, and lower back.
Do stretch mark creams really work?
There is limited clinical evidence that any cream prevents stretch marks. They may reduce itching and improve skin texture, but cannot alter genetic predisposition.