Undescended Testis and Hydrocele in Baby Boys: A Parent Guide
An undescended testis means one or both testicles have not moved down into the scrotum. Many do come down by themselves in the first few months, but if a testicle is still not in place by about 6 months, a referral to a specialist is the usual next step, with surgery commonly around the first birthday. A hydrocele, a soft fluid swelling of the scrotum, is also common in newborn boys and often goes away by itself. Neither is an emergency, but a hard, painful swelling is.
In brief
- Birth to 3 months: many undescended testicles come down on their own.
- By about 6 months: still not down means specialist referral (sooner if both sides).
- Surgery (orchidopexy): usually around 1 year.
- Retractile testis: normal testicle that pulls up with cold or touch; usually no surgery.
- Hydrocele: soft, painless, often settles in the first year.
- Emergency: a hard, painful, red or growing swelling in the groin or scrotum.
How do I check my baby boy’s testicles?
The newborn check at hospital includes the testicles, and later vaccination visits are a good chance to ask again. At home, the best time to look is when your baby is warm and relaxed, because cold and handling make the testicles pull up.
- Choose bath time or straight after, in a warm room.
- Lay the baby on his back, legs relaxed and slightly apart, like a frog.
- Look first: are both sides of the scrotum filled and roughly even?
- With warm fingers, run one finger gently from the groin down towards the scrotum on each side.
- Feel for a small, smooth, firm oval in each side of the scrotum. Do not squeeze.
- Note anything that feels empty, swollen or different, and mention it at the next doctor’s visit.
Warm bath, not cold room
If you could feel the testicle in a warm bath but cannot after a nappy change on a cold morning, that pattern points towards a retractile testis, which is usually normal. Tell the doctor exactly when you felt it and when you did not; that detail helps them more than a single exam in a chilly clinic.
Undescended testicle in a baby: why timing matters
Testicles develop inside the tummy before birth and travel down into the scrotum late in pregnancy. Boys born early are more likely to have a testicle that has not finished the trip. In many babies it arrives in the first 12 weeks or so, and by about 6 months most that will come down have done so. After that, they rarely come down on their own.
A testicle that stays up is warmer than it should be, and over time that can affect its development. Leaving it untreated is linked with lower fertility later and a higher risk of testicular cancer in adulthood. That is why doctors recommend surgery in the first year or so, rather than waiting until school age.
In the UK, the NHS refers a baby with one undescended testicle at around 4 to 5 months, and with both sides sooner, around 8 weeks. Both sides undescended, or an unusual appearance of the genitals, needs a prompt specialist look.
When to operate on an undescended testis
The operation is called an orchidopexy. A paediatric surgeon or paediatric urologist brings the testicle down and fixes it in the scrotum, usually through a small cut in the groin and another in the scrotum, under general anaesthetic. It is commonly done around 1 year old, and often the baby goes home the same day.
Occasionally the testicle cannot be felt at all. Then the surgeon may use keyhole surgery to look inside the tummy. Sometimes the testicle is found high up; sometimes it never developed properly and is absent. Hormone injections are an option some doctors discuss, but surgery is the main approach.
After surgery, expect a sore, swollen area for a few days. The surgeon will advise on pain relief (by weight, from the pack or the pharmacist), bathing and when to return for a check. Boys who had an undescended testicle should be taught the self-check and red flags as teenagers.
Retractile testis: the one that comes and goes
Some boys have a strong muscle reflex that pulls a normal testicle up into the groin when they are cold, ticklish or being examined. It can be gently brought down into the scrotum and stays there for a while. This is a retractile testis. It usually settles at puberty and does not need surgery, though doctors like to check it yearly because a small number later stay up (ascend).
Hydrocele in a baby: will it go away?
A hydrocele is fluid around the testicle inside the scrotum, so one side looks larger and feels soft, like a small water balloon. It is common in newborns and usually painless. Most go away within the first year as the fluid is absorbed.
The tricky part is the link with a hernia. Some hydroceles are connected to the tummy through a channel that did not close. If the swelling gets bigger by the evening or when the baby cries and smaller in the morning, or if you can see a bulge in the groin above the scrotum, there may be a hernia, which needs surgical repair. A simple hydrocele still present after about 1 to 2 years, or getting bigger, is usually reviewed for surgery.
Inguinal hernia in a baby: the emergency sign
An inguinal hernia is a bulge in the groin or scrotum where a loop of bowel slips through. It often appears when the baby cries or strains and disappears when calm. Hernias in babies are repaired by surgery, usually soon after diagnosis, because of the risk of the bowel getting stuck.
The swelling in the groin or scrotum becomes hard, tender, red or blue, does not go down when the baby is calm, or the baby is crying inconsolably, vomiting (especially green), or not feeding. Sudden pain or swelling of a testicle in any boy, at any age, is an emergency because it can be twisting (torsion), and a testicle can be lost within hours. Do not wait to see if it settles overnight, and do not massage, bind or apply heat or oil to the area.
Khatna timing and other questions families ask
Many Pakistani families plan khatna (circumcision) in the first weeks or months. If your son has an undescended testis, hydrocele or hernia, tell the doctor doing the khatna. Sometimes the surgeon prefers to do both under one anaesthetic later, sometimes the khatna goes ahead first; it is a joint decision with the surgeon. Aftercare is covered in khatna aftercare.
Malish (massage) is fine for the body generally, but keep oil and pressure away from a swollen groin or scrotum. Pushing on a hernia or hydrocele to “settle” it is not safe; see the malish safety guide. A baby crying a lot from gas is common, but a crying baby with a groin lump needs checking, not gripe water; newborn gas and ghutti covers the difference. More newborn guides are in Bachon Ki Sehat.
Undescended testis and hydrocele: parents ask
Is an undescended testicle in a baby serious?
It is common and treatable, not an emergency. It does need follow-up, because a testicle still not down by about 6 months usually needs surgery for future fertility and health.
Will my baby’s undescended testicle come down on its own?
Often yes, in the first few months. After about 6 months it rarely comes down by itself.
When should undescended testis surgery be done?
Usually around 1 year old, after referral by about 6 months. Doctors avoid waiting until school age.
What is a retractile testis?
A normal testicle that pulls up into the groin with cold or touch and can be brought down. It usually needs only regular checks, not surgery.
Does a hydrocele go away by itself?
Most hydroceles in newborns go away within the first year. One that persists past 1 to 2 years or keeps growing is usually reviewed for surgery.
How do I know if it is a hydrocele or a hernia?
A hernia often comes and goes, gets bigger when the baby cries, and may show a bulge in the groin. Only a doctor can tell for sure, sometimes with an ultrasound.
When is scrotal swelling in a baby an emergency?
When it is hard, painful, red or blue, does not reduce, or comes with vomiting or inconsolable crying. Go to hospital straight away.
Can khatna be done if my son has an undescended testis?
Often yes, but tell the doctor first. The surgeon may suggest doing both together under one anaesthetic.
Does an undescended testicle affect fertility?
Untreated, it can lower fertility and raise cancer risk later, which is why early surgery is recommended. Boys who had one should learn to self-check as teenagers.