My Son Is 14 and Has Not Had a Growth Spurt Yet. Is That Normal?

By The Growth Path Editorial Team · Reviewed September 2026

The short answer is: usually yes, and constitutional delay is the most common explanation. Here is the honest read on when 14-with-no-spurt is fine, when it warrants a bone age x-ray, and what a pediatrician actually looks for.

The short answer

Most 14-year-old boys who have not had a growth spurt yet are simply late developers. The medical term is constitutional delay of growth and puberty. It is benign, it runs in families, and boys with this pattern reach a normal adult height, just later than their peers. Roughly 2% of boys have some version of it.

What matters at 14 is not whether the spurt has happened yet. It is whether there are ANY signs of puberty starting. If there are, the spurt is on the way. If there are none by age 14, that is when a pediatrician will usually want a closer look.

Signs of puberty to actually look for

The first physical sign in boys is testicular growth. Parents rarely notice this. The next visible signs are:

• Genital development and pubic hair (usually the first thing parents or pediatricians observe).
• An acceleration in growth (the spurt itself usually starts 1-2 years after puberty begins internally).
• Voice changes, acne, body odor.
• Height gain of 3+ inches in a year (the spurt).

If ANY of those are showing up, puberty is underway even if the height spurt has not visibly kicked in. Boys usually gain most of their height about 12-18 months after puberty starts, so the spurt trails the earlier signs.

When 14-no-spurt is a red flag vs. just late

The general rule pediatricians use:

• Some signs of puberty, no growth spurt yet, and normal growth velocity: almost always normal. The spurt is coming.
• Some signs of puberty, no growth spurt yet, and slow growth velocity (under 2 inches in the last year): worth a pediatrician conversation but usually still nothing worrisome.
• No signs of puberty at all by 14, plus family history of late puberty: usually still just constitutional delay.
• No signs of puberty by 14, no family history of late bloomers, AND slow growth velocity: this is the specific combination that gets a bone age x-ray and often an endocrinology referral.

What bone age imaging tells you

Bone age is a single wrist x-ray. It compares the maturity of the growth plates in his hand and wrist to age-standardized references. Two useful things it tells you:

• How much growth he has left. If bone age is significantly younger than his chronological age (say, 12 when he is 14), there is more growth ahead than a chronological age would suggest.
• Whether the delay pattern fits constitutional delay. Delayed bone age with normal-for-bone-age growth velocity is the classic pattern.

Bone age is not a diagnosis. It is an information tool that helps the pediatrician decide whether to wait, keep monitoring, or refer.

Dad and family history matter more than you'd expect

If you or a brother started puberty late (age 14+), your son has a materially higher chance of the same pattern. This is called familial constitutional delay. It is the single most useful piece of context you can bring to the pediatrician visit.

If you remember roughly when your growth spurt hit, tell the pediatrician. Same for uncles and grandfathers on both sides. Family late bloomers are the single strongest reassurance that a boy without a spurt at 14 is on a normal path.

What NOT to do

• Do not try to accelerate puberty with supplements, testosterone products, or "growth boosters." None of these have been shown to increase final adult height in an otherwise-normal boy, and hormone products can shut down the natural process.
• Do not compare relentlessly to classmates. Puberty timing spreads boys the same age by three or more years.
• Do not wait past 15 to raise it if there are still zero signs. The window for pediatric endocrinology to help most is age 14-15, so bringing it up early is the right call.

What to actually do this month

1. Measure him. Same time of day, no shoes, wall + book. Write it down with the date.
2. Pull his heights from the last two well visits. Calculate growth per year.
3. Note any signs of puberty you have seen and roughly when.
4. Note family history of late puberty on both sides.
5. Bring all of this to his next visit, or call and schedule one if he does not have a well visit in the next 6 months.

Height data uses the CDC 2000 Growth Charts for boys. This page is parent education, not medical advice or diagnosis. If you have concerns about your son's growth, talk to his pediatrician, ideally with 6-12 months of measurements in hand. © 2026 The Growth Path.