Few things remind you how quickly childhood passes like realizing your child suddenly seems to have shot up in height overnight, they need new shoes, their pants are too short, and they’re asking for a second breakfast before 9 a.m.
Likewise, few things can set your mind spiraling like a checkup where you learn your child dropped off their growth curve. The reassuring news is that growth is not meant to be perfectly steady. Children often grow in waves, with slower periods followed by more noticeable change.
In this article, you’ll learn what growth spurts are, how much growth is typically expected at different ages, common signs your child may be in a rapid growth phase, how growth charts are used, and when it may be worth taking a closer look with your child’s pediatrician.
What Is a Growth Spurt?
A growth spurt is a period when a child’s body grows more rapidly than usual (1). You’ll notice a jump in height – but you’ll also likely notice changes in appetite, shifts in sleep, or temporary differences in mood and coordination.
Growth is a normal biological process, but it does not happen at exactly the same pace every week or every month. In general, children grow rapidly from birth through about the first 1 to 2 years of life. After that, growth continues in a steadier way and gradually slows until the adolescent growth spurt begins. So, it can seem like your child grew overnight during some phases of accelerated growth!
Average Height Gained Per Year During Childhood
There is a wide range of normal when it comes to growth during childhood, but there are some broad patterns parents can keep in mind.
- In the first year of life, babies typically grow about 10 inches (25 cm) total. After that, growth slows (2).
- From about age 2 until puberty, children usually grow at a slower, and steadier rate, often around 5 to 7 cm per year (3).
- Once puberty begins, growth speeds up again. In girls, this usually happens sometime between about ages 9 and 13, and in boys between about ages 12 and 16. Girls may gain about 9 cm in their peak growth year, while boys may gain more than 10 cm in theirs (4).
Growth is influenced by genetics, nutrition, sleep, overall health, hormones, and other factors (5). This is one reason pediatricians pay attention not just to one isolated measurement, but to how a child tracks over time.
Common Signs of a Growth Spurt
One of the most common signs parents notice right before and during a growth spurt is increased hunger. Growth requires energy and raw materials. Bones, muscles, connective tissue, hormones, and the nervous system all depend on adequate nourishment. A child who suddenly seems much hungrier than usual may simply be in a period of increased need.
As growth slows after the toddler years, children often need fewer calories overall, and parents may notice that appetite becomes less intense or more inconsistent. This is especially common around age 2, when eating habits can seem erratic. Some children may eat very little one day and much more next while still continuing to grow and thrive.
To learn more about picky eating, read this article: Nutrient & Calorie Dense Foods That Help Underweight Kids Thrive
That said, if your child is suddenly much sleepier than usual, their sleep habits do not return to baseline within a week or two, or something simply feels off, it is worth checking in with your child’s pediatrician. While temporary changes in sleep can absolutely happen during periods of rapid growth, significant or persistent fatigue deserves a closer look.
Parents may also notice temporary clumsiness and more emotional sensitivity during a growth spurt. When the body is changing quickly, coordination and regulation can take time to catch up.
Children who are just beginning to walk often have an (adorable!!) rounded belly, a curved lower back, and may even appear somewhat bow-legged. By around age 3, muscle tone typically improves, body fat percentage decreases, and many children begin to look leaner and more muscular.
Why Growth Charts Matter
The CDC explains that growth charts are percentile curves showing how a child’s measurements compare with a reference population, and that they help track the growth of infants, children, and adolescents (6).
It’s important to understand growth charts not as single points on the chart, but the trend over time. The rate and pattern of growth matter more than one number alone. A sudden drop across percentile lines, or a pattern that no longer fits a child’s usual trajectory, is often more meaningful than one isolated measurement.
It is important to understand that a child does not need to be in a high percentile to be healthy. Many children are naturally smaller or larger than peers and are doing perfectly well. Growth charts are helpful because they allow us to quickly notice if a child falls significantly off their usual curve, has poor weight gain, or shows a pattern that seems inconsistent over time that may prompt further evaluation (6).
Leap Weeks in Infancy: What Parents Should Know
Many parents hear about “leap weeks,” sometimes called “wonder weeks,” during infancy. These terms are used to describe periods when babies may seem fussier, clingier, hungrier, or more wakeful as they move through phases of rapid development. The idea is that as babies gain new skills and become more aware of the world around them, parents may notice temporary shifts in sleep, mood, feeding, and behavior.
Many parents find this framework very helpful because it gives language to changes they are already noticing and can make certain phases feel more understandable.
At the same time, it is important to remember that all babies follow their own timeline. Some may seem to move through noticeable phases, while others develop in a steadier or less predictable way. If your baby seems clingier, fussier, hungrier, or more wakeful for a stretch, a developmental leap may certainly be part of the picture. But babies are also influenced by many other factors, including feeding needs, teething, illness, overstimulation, and individual temperament.
The most helpful takeaway is often to use the idea of leap weeks as a gentle framework rather than a strict schedule. Babies grow and change quickly in the first year of life, but they do not all do it in exactly the same way or at exactly the same time. It can also be reassuring to remember that different parts of the body and nervous system mature at different rates during early life. For example, the brain does most of its growth in the early years, while the kidneys are already functioning at an adult level by the end of the first year.
Tanner Stages and Puberty Growth
Once children enter puberty, doctors often use Tanner stages, also called sexual maturity ratings, to describe the physical stages of development (7). This system helps clinicians assess pubertal progression because age alone does not tell the whole story. Two children of the same age can be in very different phases of puberty.
Tanner staging generally runs from Stage 1 to Stage 5. Stage 1 reflects a prepubertal body. Stages 2 through 4 reflect progressive development, and Stage 5 reflects mature adult-type development (7). In girls, clinicians look at breast development and pubic hair. In boys, they look at genital development and pubic hair.
Tanner stages help explain why two children in the same grade can look so different in height, appetite, body composition, and pace of change.
Remember, beyond growth in height a lot is going on beneath the surface, and not all organs grow on the same schedule. For example, the reproductive system has a brief burst of growth after birth, then changes very little until puberty, when sexual maturation begins in full force.
Do Kids Actually Grow in Their Sleep?
Parents often say their child “grew overnight,” and while growth is not literally confined to nighttime, sleep is a major part of healthy development. Good sleep supports hormone regulation, tissue repair, learning, mood, and overall growth.
This is one reason some children seem especially tired during growth spurts. Their bodies may genuinely need more rest. Protecting sleep routines can make a real difference during these phases.
What About Growing Pains?
Some children complain of aching legs during childhood, especially in the evening or at night. Parents often call these “growing pains.”
Occasional mild aches may improve with rest, a warm bath, gentle massage, hydration, or a calming bedtime routine. But pain should not automatically be dismissed. Pain that is persistent, localized to one area, associated with swelling, limping, fever, or daytime symptoms deserves medical attention.
To learn more about supporting your child through occasional growing pains, read this article: Natural Treatments For Growing Pains
When to Talk With Your Child’s Pediatrician About Your Child’s Growth
It is worth checking in with your child’s pediatrician if your child seems to fall off their usual growth pattern, has very poor weight gain, loses weight unexpectedly, has persistent fatigue, or unusually early or delayed puberty.
Summary
Growth spurts are a normal part of childhood, and sometimes it quite literally seems like our children are growing overnight! Rapid growth is especially common in infancy, slows into a steadier pattern through most of childhood, and then speeds up again during puberty. Along the way, it is normal to see shifts in appetite, sleep, coordination, mood, and even body shape. Growth charts can help put those changes into context by showing the pattern over time rather than focusing too much on one measurement. It is important to keep in mind that every child has their own timeline!
References:
- Boeyer ME, Leary EV, Sherwood RJ, Duren DL. Evidence of the non-linear nature of skeletal maturation. Arch Dis Child. 2020 Jul;105(7):631-638. doi: 10.1136/archdischild-2019-317652. Epub 2020 Jan 23. PMID: 31974297; PMCID: PMC7592265.
- American Academy of Pediatrics. (2020). Term Infant Growth Tools. Aap.org. https://www.aap.org/en/patient-care/newborn-infant-and-early-childhood-nutrition/newborn-and-infant-nutrition-assessment-tools/term-infant-growth-tools/
- Lee JH, Kim SK, Lee EK, Ahn MB, Kim SH, Cho WK, Cho KS, Jung MH, Suh BK. Factors affecting height velocity in normal prepubertal children. Ann Pediatr Endocrinol Metab. 2018 Sep;23(3):148-153. doi: 10.6065/apem.2018.23.3.148. Epub 2018 Sep 28. PMID: 30286571; PMCID: PMC6177663.
- Abbassi V. Growth and normal puberty. Pediatrics. 1998 Aug;102(2 Pt 3):507-11. PMID: 9685454.
- Gong L, Song Y, Cheng S, Du J, Liang J. Analysis of growth and development levels and influencing factors in children aged 3-12 years in a certain region: a cross-sectional study. Front Public Health. 2025 Sep 10;13:1523626. doi: 10.3389/fpubh.2025.1523626. PMID: 41000302; PMCID: PMC12457151.
- CDC. (2023, October 20). Growth Charts – CDC Extended BMI-for-Age Growth Charts – Download. Www.cdc.gov. https://www.cdc.gov/growthcharts/who-charts.html
- Emmanuel M, Bokor BR. Tanner Stages. [Updated 2022 Dec 11]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK470280/
