In most babies, the testes are already in the scrotum at birth or move down within the first 3–6 months of life.
New parents notice diaper details fast. If you’re asking at what age do testicles drop, you’re in good company. One common question at early checkups is whether both testicles are in the scrotum. That’s normal curiosity, and it’s also a routine part of infant exams.
This guide explains what “dropping” means, the usual timing, what can change the timeline, and when to ask for a specialist exam.
What “Dropping” Means In Plain Terms
Before birth, the testes form in the abdomen. During pregnancy they travel down toward the groin and then into the scrotum. When people say “the testicles drop,” they mean that final move into the scrotum.
Two details make the topic easier:
- Position can shift. Warmth relaxes the scrotum; cold, crying, or excitement can pull a testicle up.
- Not every “missing” testicle is truly undescended. Some are retractile, meaning they move up and down with a reflex.
When Do Testicles Drop For Most Babies
Many full-term babies have both testes in the scrotum at birth. When one isn’t there at birth, lots of cases settle on their own in the first months after delivery. Several medical references describe the first 3–6 months as the main window for spontaneous descent, with fewer changes after that point.
Doctors track this at routine visits. A clinician checks the scrotum, then feels along the groin to find where each testis sits. If the position is unclear, they re-check later and document what they find.
Typical Timeline Parents Hear At Visits
- 0–3 months: Many testes that were high at birth move down during this period.
- 3–6 months: Descent can still occur, yet the odds drop as months pass.
- After 6 months: If a testis still isn’t in the scrotum, most guidance advises referral for evaluation rather than waiting.
Why Timing Can Differ
If your baby was born early, timing can shift. Undescended testes are more common in preterm infants, and clinicians often use corrected age when thinking about referral timing.
Another reason for mixed messages is vocabulary. A retractile testis can often be guided into the scrotum during an exam and may stay there once the muscle relaxes. Merck’s consumer guidance notes that retractile testes often stop retracting by puberty and usually don’t need surgery. Merck Manual’s overview of undescended and retractile testes lays out the distinction in parent-friendly language.
An undescended testis (cryptorchidism) sits outside the scrotum and can’t be kept there on exam. Some boys also develop secondary ascent, where a testis documented in the scrotum earlier later sits higher. That’s why testicular position is checked at many well-child visits, not only at birth.
What You Can Notice At Home
You don’t need to press or poke. A simple, gentle check is enough:
- During a warm bath, look for fullness on each side of the scrotum.
- If your child is cold or upset, the scrotum can tighten and the testes can pull up.
- If you keep noticing one side looks empty when your child is warm and calm, bring it up at the next visit.
At What Age Do Testicles Drop?
Parents usually hear a clear rule: most descent that is going to happen on its own happens by around 3–6 months, and a testis that is still not in the scrotum by 6 months should be evaluated. The goal is to avoid long delays that can raise later risks for fertility potential and testicular health.
The American Urological Association cryptorchidism guidance sets out evaluation and timing goals that center on timely assessment and treatment. For a plain-language view, the Mayo Clinic overview of undescended testicle notes that many undescended testes descend within a few months after birth, with surgery used when they do not.
What “Referral By 6 Months” Usually Means
Referral does not mean a baby is headed straight to surgery that day. It means a pediatric urologist or pediatric surgeon confirms the exam findings, checks for related issues like a hernia, and plans timing if treatment is needed.
When a true undescended testis is present, many clinicians aim for orchiopexy (surgery to bring the testis into the scrotum) in infancy rather than years later. A common target window is between 6 and 18 months of age, depending on the case and local practice.
Table Of Ages, Terms, And Next Steps
The terms can feel confusing. This table groups common situations and what usually happens next.
| Situation | What It Often Looks Like | Typical Next Step |
|---|---|---|
| Testes in scrotum at birth | Both sides feel full on exam | Routine checks at well-baby visits |
| Palpable testis high in groin (newborn) | Felt in groin, not in scrotum | Re-check over first months; document position |
| Spontaneous descent in early infancy | Reaches scrotum over weeks to months | Continue routine exams |
| Undescended testis still not down by 6 months | Cannot be kept in scrotum on exam | Referral for specialist evaluation |
| Retractile testis | Moves up when cold; can be guided down | Monitor over time; often no surgery |
| Ascending (acquired) undescended testis | Was down earlier, later sits higher | Specialist evaluation when detected |
| Non-palpable testis | Not felt in groin or scrotum | Specialist evaluation; may need laparoscopy |
| Bilateral non-palpable testes in newborn | Neither testis can be felt | Prompt evaluation for broader causes |
What Happens At The Clinic
Most appointments are simple. The clinician wants a calm child, warm hands, and time. A relaxed exam helps separate retractile from undescended.
Questions You’ll Likely Hear
- Was your child born early?
- Was the testis ever documented in the scrotum?
- Have you noticed the scrotum looking fuller at times, like during a bath?
- Any groin swelling that could suggest a hernia?
Why Ultrasound Often Isn’t The First Step
It sounds logical to “just scan it.” Still, many guidelines say ultrasound before specialist referral rarely changes the plan because the physical exam guides care. The AAFP review on cryptorchidism summarizes evidence-based evaluation and referral points, including the limited value of routine imaging before referral.
Risks Doctors Try To Reduce
A testis that stays outside the scrotum is exposed to higher body heat, and that can affect how the tissue develops. Guidelines link untreated cryptorchidism with reduced fertility potential and a higher risk of testicular cancer later in life, even though the absolute cancer risk for any one boy remains low.
Earlier orchiopexy places the testis where it belongs, makes later exams easier, and may improve fertility outcomes compared with late repair. It does not erase every risk, yet it moves odds in a better direction.
Other Problems That Can Come Along
- Inguinal hernia: A bulge in the groin that can come and go.
- Testicular torsion: Sudden pain and swelling; this is an emergency.
- Differences in size: A long-standing undescended testis can be smaller.
If your child has sudden scrotal or groin pain, swelling, vomiting, or a hard tender lump, seek urgent medical care right away.
Table Of “Normal Variation” Versus “Time To Call”
This table sorts common observations into a next action.
| What You Notice | Often Fits With | What To Do |
|---|---|---|
| Scrotum looks fuller in a warm bath | Normal relaxation or retractile testis | Bring it up at the next well visit |
| One side often looks empty, even when warm | Possible undescended testis | Book a checkup soon |
| Testis can be felt, yet it pops back up fast | Retractile or high-riding testis | Ask for exam documentation and follow-up |
| Neither testis seems present in the scrotum | Needs prompt medical evaluation | Call your child’s clinician today |
| Testis was down before, now it seems higher | Possible ascending testis | Arrange an appointment in the next weeks |
| Sudden groin or scrotal pain with swelling | Torsion or incarcerated hernia | Go to emergency care now |
| Bulge in groin that comes and goes | Possible inguinal hernia | Schedule a medical review |
What Treatment Looks Like
If a true undescended testis is diagnosed, orchiopexy is the usual treatment. The surgeon brings the testis down into the scrotum and secures it. It’s often a day procedure. Kids tend to bounce back fast, with soreness that fades over days.
If the testis cannot be felt, the specialist may use laparoscopy to locate it. Sometimes the testis is absent or has shrunk due to reduced blood flow earlier in life. When that happens, the plan shifts to what follow-up makes sense for your child.
How To Get The Most From A Checkup
If you want a productive visit, go in with a short list:
- Ask what the exam found today: right, left, or both; scrotal, high scrotal, inguinal, or non-palpable.
- Ask whether the testis could be held in the scrotum or it sprang back up right away.
- Ask what age triggers referral in your area and what the next appointment should be.
- If your child was born early, ask whether the timeline is based on corrected age.
A Calm Takeaway For Parents
Most families never need to do more than show up for routine visits. When a testis is not in the scrotum at birth, many cases settle in the first months. When it doesn’t, early evaluation is the safest path. It keeps options open and keeps care on track.
References & Sources
- American Urological Association (AUA).“Evaluation and Treatment of Cryptorchidism.”Clinical guideline outlining evaluation and timing for referral and treatment.
- Mayo Clinic.“Undescended testicle (cryptorchidism) – Symptoms and causes.”Patient-friendly overview of typical timing and next steps when descent does not occur.
- American Academy of Family Physicians (AAFP).“Cryptorchidism (Undescended Testicle).”Primary-care review covering diagnosis, referral timing, and why routine imaging is often not needed.
- Merck Manual (Consumer Version).“Undescended Testes and Retractile Testes.”Explains differences between retractile and undescended testes and typical management.