In this article:
Why Are Some Babies Born With an Extra Nipple?
Extra nipples develop during the early stages of foetal development. Around the fourth week of pregnancy, thickened strips of skin tissue called mammary ridges, or milk lines, appear from the armpits to the groin.In the sixth week, mammary buds begin to grow from these ridges. Normally, the ridges survive only on the chest, where breasts develop. When the ridges fail to regress elsewhere, a supernumerary nipple forms.
Most cases occur without an identifiable cause, and having an extra nipple does not mean that a parent did anything wrong during pregnancy. Some cases may run in families, suggesting a genetic influence. However, many babies with supernumerary nipples have no family history of the condition.
Where Do Extra Nipples Appear in Newborns?
Supernumerary nipples most commonly appear along the milk lines, which run from the armpits down the chest and abdomen towards the groin. They may be found:- Below or beside the normal nipples
- On the upper or lower abdomen
- Near the armpits
- Along the lower chest or upper abdomen
An accessory nipple may be the only extra structure present. In other cases, it may be accompanied by a small amount of underlying breast tissue. Most are much smaller than normal nipples and may have no visible opening or raised centre.
An extra nipple may look like a small mole, bump or darker patch. It may occur with or without an areola and, in some cases, underlying breast tissue. Most babies have no symptoms and do not require treatment.
What Does a Supernumerary Nipple Look Like in a Newborn?
An extra nipple can look like a tiny, flat or slightly raised spot. It may be the same colour as the surrounding skin or darker, like a small mole. Some have a central bump or a faint ring of pigmented skin around them.Depending on how much tissue has developed, an extra nipple may be difficult to distinguish from a birthmark. Occasionally, a small lump beneath the skin indicates the presence of accessory breast tissue.
These are two separate types:
- Polythelia: An extra nipple with no breast tissue underneath.
- Polymastia: An extra nipple with breast tissue underneath, which is rarer.
Are Supernumerary Nipples Harmful to Babies?
Most supernumerary nipples are harmless and remain small. They usually do not cause pain or interfere with breastfeeding, bottle-feeding, or normal development.However, extra nipples can occasionally become more noticeable during puberty because of hormonal changes. If glandular tissue is present, it may swell or become tender during hormonal changes. In rare cases, accessory breast tissue can also produce milk.
An isolated extra nipple is generally not a sign of an underlying health problem. Some studies have explored possible associations between supernumerary nipples and kidney or urinary tract abnormalities, but the evidence is inconsistent. An extra nipple alone does not establish that a baby has a kidney problem.
Do Supernumerary Nipples in Babies Need Treatment?
Extra nipples without glandular tissue do not develop into breasts at puberty.Surgical removal is usually considered only if the extra nipple causes persistent irritation, becomes painful, or has associated tissue that causes problems, or if the family prefers it for cosmetic reasons.
It is a minor day-case procedure under local anaesthetic. For a baby, doctors suggest waiting until middle childhood rather than operating in infancy.
An extra nipple is usually a harmless variation present from birth, and a paediatrician’s examination can help parents understand whether any follow-up is needed.
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FAQs on Supernumerary Nipples: Why Some Babies Are Born With an Extra One
- Is an extra nipple in a baby normal?
Yes. It is usually a normal developmental variation and is generally unrelated to other conditions. - Can a supernumerary nipple produce milk?
Occasionally. Pregnancy hormones can cause swelling and milk release from an extra nipple. - At what age can an extra nipple be removed?
There is no medical urgency. Doctors usually advise waiting until middle childhood if the nipple is harmless.
