Pregnancy

Linea Nigra: The Dark Line on Your Belly

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Linea nigra is the dark line that runs down the belly in pregnancy, caused by a temporary rise in skin pigment from hormones. It is normal and harmless, usually appears in the second trimester, and fades on its own after birth. It cannot predict the baby's sex.

Last updated: July 2026

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What is the dark line on my belly?

A linea nigra is a band of darker skin, roughly a centimeter wide, running vertically from the pubic bone toward the navel. Nearly everyone already has a faint version of this line, called the linea alba, but pregnancy hormones deepen its color until it becomes visible, often within the first 12 weeks. According to the Office on Women's Health, skin changes are among the common, expected features of a healthy pregnancy 1, and routine antenatal care includes regular checks where such changes can be raised 2. The line tends to darken as pregnancy advances and is often most noticeable in the third trimester, over the final weeks before roughly 40 weeks of gestation. Skin tone influences how prominent it looks, and it is often more noticeable in people with more pigmented skin.

What causes the linea nigra to darken?

Pregnancy hormones drive the pigment change behind the linea nigra. Rising estrogen and progesterone stimulate melanocytes, the cells that produce melanin, which is why many people also notice darker nipples, freckles, and moles during the same months. The same hormonal shift produces melasma, the blotchy facial darkening sometimes called the mask of pregnancy, and can deepen dark spots on the face. Increased pigment is simply the skin responding to hormones, not a deficiency or a warning sign. Because the effect is hormone-driven, it often appears alongside other benign changes and tends to be more pronounced with each successive pregnancy.

When does the belly line usually fade?

The linea nigra almost always fades on its own after the baby arrives. As hormone levels fall in the weeks and months after birth, melanin production returns to baseline and the line gradually lightens, often over 6 to 12 months, and usually resolving fully within about 18 months, though a faint trace can linger longer. According to the NICE postnatal care guideline, most normal skin changes of pregnancy resolve during the recovery period without any treatment 3. Sun exposure can darken the line, so many people find that shade and a broad-spectrum sunscreen keep it from standing out while it fades. There is no proven cream that speeds the process, and the pigment sits too deep for most topical products to reach quickly.

Can the line predict my baby's sex?

No evidence supports using the linea nigra to guess whether you are carrying a boy or a girl. Folk beliefs claim that a line reaching above the navel signals a boy, or that its darkness reveals sex, but pigment intensity reflects your hormones and skin type, not fetal anatomy. The reliable way to learn sex is through ultrasound, usually offered around 18 to 20 weeks, or genetic screening during routine prenatal appointments. Skin darkening can, however, be more striking in people with naturally deeper skin tones, and the same is true for hyperpigmentation on deeper skin elsewhere on the body. Treating the line as a curiosity rather than a clue keeps expectations realistic.

When should the belly line be checked by a clinician?

Most linea nigra needs no medical attention at all. A clinician is worth involving if the line changes in ways that do not fit the usual pattern, for instance a mole within it that grows, bleeds, or shifts in color, which warrants evaluation regardless of pregnancy. Skin changes that come with itching severe enough to disturb sleep, or with yellowing of the skin or eyes, can point to a liver-related condition of pregnancy and deserve a prompt visit. Pigment changes that persist well beyond the first year after birth, or that appeared before pregnancy, are also reasonable to mention. Adolescents and people in the perimenopausal years can see hormone-related pigment shifts too, so hormones rather than the pregnancy alone drive the change. Gale can help you prepare those questions.

Common questions

Not everyone, but it is very common, and it tends to be more visible in people with more pigmented skin. The faint linea alba is already present in most people; pregnancy hormones simply darken it. Whether it shows up, and how dark it gets, varies from person to person.

For most people it fades on its own over the months after birth as hormone levels return to normal, often within 6 to 12 months. A faint trace can linger longer. There is no cream proven to speed the fading, since the pigment sits deep in the skin.

No. The old belief that a line reaching above the navel predicts a boy has no evidence behind it. The line's darkness reflects your hormones and skin type, not the baby's sex. Ultrasound or genetic screening is the reliable way to find out.

There is no reliable way to prevent it, because it is driven by hormones rather than anything you did. Sun exposure can make it darker, so shade and sunscreen may keep it less noticeable, but the line itself is a normal part of many pregnancies.

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When a belly line in pregnancy needs a closer look

  • —A mole or spot within the line that grows, bleeds, or changes color is a reason to seek a skin evaluation, whether or not you are pregnant
  • —Intense itching severe enough to disturb sleep, especially on the palms or soles, is a reason to seek prompt prenatal review
  • —Yellowing of the skin or the whites of the eyes alongside skin changes is a reason to contact your clinician promptly
  • —A dark line or patches that appeared before pregnancy or persist well beyond the first year after birth are a reason to ask a clinician

This article is general health education, not medical advice. Whether a skin change in pregnancy needs evaluation should be decided with your prenatal clinician or a dermatologist based on your individual situation.

References

  1. 1.Office on Women's Health (U.S. HHS) (2025). Prenatal care. Office on Women's Health (womenshealth.gov), U.S. HHS. link ✓Skin changes are among the common, expected features of a healthy pregnancy; general prenatal care and what is normal by trimester.
  2. 2.National Institute for Health and Care Excellence (2024). Antenatal care (NG201). National Institute for Health and Care Excellence (NICE). link ✓Routine antenatal care includes regular appointments where common pregnancy changes and symptoms can be raised and assessed.
  3. 3.National Institute for Health and Care Excellence (2026). Postnatal care (NG194). National Institute for Health and Care Excellence (NICE). link ✓Most normal skin and body changes of pregnancy resolve during the postnatal recovery period without specific treatment.

3 sources, numbered by first appearance. General health information, not medical advice. AI-assisted editorial content — every citation independently verified. Editorial policy

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