At What Age Does Testicles Descend? | Timing And Delays

Most babies have both testicles in the scrotum before birth, and many undescended ones move down by about 3 to 6 months after birth.

Parents usually notice this question right after a newborn exam: when should the testicles be down, and when is a delay no longer normal? The timing matters because a testicle that stays outside the scrotum for too long can face more trouble later with growth, fertility, and twisting.

The plain answer is this: in most boys, both testicles descend before birth. If one or both are not down at birth, there is still a window where they may move into place on their own during the first few months. After about 6 months, spontaneous descent becomes much less likely, so doctors usually stop waiting and start planning the next step.

This article walks through the normal timeline, what parents may notice at home, what doctors check during visits, and when surgery enters the picture. It stays practical, so you can tell the difference between a normal delay, a retractile testicle, and a true undescended testicle that needs treatment.

When Testicles Usually Move Down Before And After Birth

Testicles start forming in the abdomen during pregnancy. As the baby grows, they travel downward through the groin and into the scrotum. By the time a full-term baby is born, that trip is usually complete.

That is why many boys are born with both testicles already in the scrotum. Premature babies are more likely to have one or both still sitting higher up because the descent process may not have finished yet.

If a newborn has an undescended testicle, the first few months are still a watchful period. Many of these testicles descend during early infancy. Pediatric sources such as HealthyChildren’s undescended testicles page and the NHS both note that this often happens by around 6 months.

• Before birth: most testicles descend into the scrotum.
• At birth: some boys, especially those born early, still have one or both testicles undescended.
• By 3 to 6 months: many delayed cases settle on their own.
• After 6 months: natural descent is less likely, so doctors usually move toward referral and treatment planning.

At What Age Does Testicles Descend? In Real-Life Terms

If you want the timing in one line, this is it: most testicles are already down at birth, and most of the rest that will descend on their own do so by 3 to 6 months of age.

That makes 6 months a practical cutoff in many clinics. Once a baby reaches that age and a testicle is still not in the scrotum, the usual plan changes from “watch and recheck” to “refer and treat.” The exact timing can shift a bit if the baby was premature, since doctors often use corrected age.

Parents often ask whether a late drop can still happen after that. It can, but it is not the pattern doctors count on. That is why delayed cases should not drift for another year with no plan. The window for a simple fix is best used early.

Why The Scrotum Matters

The scrotum keeps the testicles a bit cooler than the rest of the body. That cooler setting helps normal development. When a testicle stays in the abdomen or groin, it sits in a warmer spot. Over time, that can affect how well it grows and works.

There is another reason doctors do not like to wait too long. An undescended testicle can be harder to examine, which makes later tracking less clear. There is a higher chance of a groin hernia in some children too.

How Doctors Tell A Delay From A Different Problem

Not every testicle that seems “missing” is truly undescended. This is where the exam matters. A doctor will gently feel the groin and scrotum to see where the testicle is and whether it can be brought down.

There are a few common patterns:

• Undescended testicle: it never reached the scrotum or does not stay there.
• Retractile testicle: it can move up from the scrotum because of a brisk muscle reflex, then come back down.
• Ascending testicle: it was down before, then later sits higher and no longer stays in the scrotum.

A retractile testicle usually does not need surgery right away. It does need repeat checks because some boys later develop an ascending testicle. The MSD Manual makes that distinction clear, and that is one reason regular well-child exams matter.

Situation	What It Usually Means	What Doctors Often Do
Both testicles down at birth	Normal descent completed before delivery	Routine exams during child visits
One testicle not down at birth	Common newborn finding, more common in preterm babies	Recheck during the first months
Both testicles not down at birth	Needs prompt medical review	Closer follow-up and specialist input
Testicle descends by 3 to 6 months	Spontaneous descent during infancy	No surgery if it stays in place
Still undescended after 6 months	Less likely to descend on its own	Referral to a surgical specialist
Can be moved down, then springs back up	May be retractile	Watch over time with repeat exams
Was down before, now sits high	Possible ascending testicle	Reassessment; surgery may be needed
Pain, swelling, vomiting, sudden distress	Possible torsion or another urgent problem	Get urgent care right away

When Parents Should Stop Waiting

The first few months are the grace period. After that, waiting tends to lose its upside. Many specialists want referral if the testicle is still undescended by 6 months of corrected age. The NHS and pediatric urology guidance line up on that timing.

That does not mean every child has surgery on the exact day he turns 6 months old. It means the child should be on the path to treatment, not stuck in a loose “let’s see what happens” loop.

If your baby was born early, corrected age matters. Doctors may count from the due date rather than the birth date when they judge whether the descent window is still open.

Signs That Deserve A Prompt Visit

Call your child’s doctor sooner if:

• you cannot feel one or both testicles in the scrotum after the newborn period
• a testicle seems to come and go, then starts staying up high
• the scrotum looks uneven and that change is new
• your child has groin pain, swelling, vomiting, or sudden fussiness

That last group of symptoms needs fast care, not a routine follow-up. A twisted testicle is rare, but time matters.

What Treatment Usually Looks Like

If a testicle has not descended by about 6 months, treatment is usually surgery called orchiopexy. The surgeon moves the testicle into the scrotum and secures it there. The operation is common, and many children go home the same day.

The goal is not just cosmetic. Early placement in the scrotum gives the testicle a better setting for growth and makes later exams much easier. It may also lower some long-term risks tied to an undescended testicle, though it does not erase them completely.

The NHS page on undescended testicles and pediatric surgery resources note that surgery is often done during the first year or soon after, rather than waiting until toddler age unless there is a special reason.

Age Or Stage	What Usually Happens	Typical Next Step
Birth	Doctor checks whether both testicles are in the scrotum	Document position and recheck if needed
First months	Some undescended testicles move down on their own	Watch during routine visits
Around 6 months	Spontaneous descent becomes less likely	Referral to pediatric urology or surgery
Infancy to early toddler period	Orchiopexy is often planned	Move testicle into the scrotum
After treatment	Doctor checks healing and position	Routine follow-up

Questions Parents Ask During Checkups

Can A Testicle Move Up And Down?

Yes. A retractile testicle can slide up because of a muscle reflex, then come back down. That is different from a true undescended testicle, which does not stay in the scrotum. The difference can be tricky at home, so the office exam matters more than guesswork.

Does An Ultrasound Help?

Parents often expect a scan right away. In many routine cases, the physical exam gives more useful information than imaging. That is why doctors often refer based on exam findings rather than ordering an ultrasound first.

Can This Affect Fertility Later?

It can, especially if the testicle stays undescended for a long time or both sides are involved. Early treatment is meant to reduce that risk. It is one reason doctors act sooner rather than later once the 6-month mark passes.

What If My Child Is Older And This Is Noticed Late?

Older children can still be treated, and they still need an exam. Some boys have an ascending testicle that was down before and then moved up later. So this is not only a newborn issue.

What To Take Away From The Timing

If you are checking the calendar, the best answer is simple. Most testicles descend before birth. Many that are undescended at birth come down by 3 to 6 months. After 6 months, waiting rarely helps much, and a specialist visit is usually the next move.

That timeline gives parents a clear marker. A newborn finding does not always mean surgery. A six-month-old with the same finding should have a plan. That is the line most doctors use because it matches how the condition behaves in real life.

If you are unsure what you are feeling in the scrotum, ask your child’s doctor during the next visit or sooner if the area looks painful or swollen. A quick exam can sort out whether this is a normal reflex, a delayed descent, or a problem that should be treated.