Constitutional Growth Delay
The short answer
Constitutional growth delay (CGD) is a pattern where a child grows at a slower rate during infancy and early childhood but eventually catches up, reaching a normal adult height. These children are often called "late bloomers." Their growth rate typically slows during the first 2-3 years, causing them to fall to a lower percentile, but then continues at a normal rate along that lower curve before experiencing a later-than-average growth spurt. It is a variation of normal growth, not a disease, and often runs in families where a parent was also a late bloomer.
By Age
What to expect by age
In the newborn period, constitutional growth delay is not yet apparent. Most babies with CGD are born at a normal size. The pattern typically begins to show after the first few months of life when growth velocity slows compared to peers. At this stage, if your baby is growing well, there is no concern. If growth is slow, other causes (such as feeding problems or medical conditions) need to be ruled out first.
Some babies with constitutional growth delay begin to show a downward shift in their growth percentile during this period. While this pattern looks concerning on a growth chart, the key is that the baby remains proportional (weight and length both lower) and is otherwise healthy and meeting developmental milestones. Your pediatrician will want to ensure adequate nutrition and rule out other causes before attributing the pattern to CGD.
By this age, babies with CGD may have settled into a lower growth percentile - for example, dropping from the 50th to the 15th percentile. The important distinction is that once they reach their new curve, they follow it consistently. Family history is helpful: if a parent was short as a child but reached normal adult height, this supports a CGD pattern. Your pediatrician will continue monitoring growth and may check basic labs to rule out thyroid problems, celiac disease, or other conditions.
Toddlers with CGD are typically the smallest in their age group but are healthy, active, and developing normally. Their bone age (assessed by an X-ray of the wrist) is often delayed compared to chronological age, which actually predicts more remaining growth potential. No treatment is necessary for CGD - these children will eventually catch up, often during a later growth spurt around puberty. Ensuring adequate nutrition with a balanced diet supports their growth trajectory.
What Should You Do?
When to take action
- Your baby dropped from a higher to a lower growth percentile during the first 1-2 years but is now following the new curve consistently and is otherwise healthy.
- A parent or close family member was a "late bloomer" who was small as a child but reached normal adult height - CGD often runs in families.
- Your toddler is small for age but is proportional, active, eating well, and meeting all developmental milestones.
- Your child's bone age is delayed relative to chronological age - this is consistent with CGD and actually indicates more growth potential.
- Your baby's growth has been steadily declining across percentile lines and you want to confirm the pattern is consistent with CGD rather than another condition.
- Your toddler is significantly smaller than peers and there is no family history of late blooming.
- You notice your child is not just small but also seems fatigued, is not meeting milestones, or has other symptoms.
- Your baby or toddler's growth is decelerating rapidly (crossing multiple percentile lines in a short period) with no clear explanation - this needs medical evaluation to rule out underlying conditions.
- Your child has poor growth along with symptoms such as chronic diarrhea, vomiting, fatigue, or developmental concerns - these suggest a medical cause rather than CGD.
Sources
Related Resources
Related Physical Concerns
My Baby Seems to Use One Side More Than the Other
Babies should use both sides of their body fairly equally during the first 18 months of life. While slight preferences can be normal, a consistent pattern of favoring one side - using one arm much more than the other, crawling with one leg dragging, or turning the head predominantly one way - should always be discussed with your pediatrician. Early identification of asymmetry leads to the best outcomes.
Baby or Toddler Body Odor - When Is It Normal?
Babies and toddlers can develop body odor from several benign causes: sour milk caught in skin folds, sweating, diaper area odor, strong-smelling foods in the diet, and certain medications or vitamins. True body odor (like adult BO from apocrine glands) should not occur before puberty. If your baby or young toddler has a persistent unusual body odor that is not explained by skin folds, diaper, or diet, it could indicate a metabolic condition, infection, or foreign body (especially in the nose or vaginal area). Unusual persistent odor warrants a doctor visit.
Baby Born with Teeth - Natal Teeth
Natal teeth (teeth present at birth) occur in about 1 in 2,000-3,000 births. In most cases, these are actual primary (baby) teeth that erupted early, not extra teeth. Most natal teeth are the lower front incisors. While natal teeth can sometimes cause breastfeeding difficulties or have a risk of becoming loose and being a choking hazard, many can be left in place and monitored. The decision to keep or remove a natal tooth depends on how firmly it is attached and whether it is causing problems.
Baby Bottle Tooth Decay (Early Childhood Cavities)
Baby bottle tooth decay (also called early childhood caries) happens when a baby's teeth are frequently exposed to sugary liquids - milk, formula, juice, or sweetened drinks - especially during sleep. The earliest sign is chalky white spots near the gumline of the front teeth. This is preventable and, if caught early, the damage can be stopped. The AAP recommends never putting a baby to bed with a bottle of anything other than water, and starting dental visits by age 1.
Baby Clenching Fists After 3 Months
Newborns naturally keep their fists clenched due to the palmar grasp reflex. Hands should begin opening more by 2 months and be mostly open by 3-4 months. By 4 months, your baby should be reaching for objects with open hands. If your baby's fists remain tightly clenched after 3-4 months, especially with thumbs tucked inside the fist (cortical thumbs), it could indicate increased muscle tone (hypertonia) and should be evaluated. However, some babies simply have a stronger grasp reflex that takes longer to fade.
My Baby Curls Their Toes
Toe curling is very common in babies and is usually caused by the plantar grasp reflex, which is a normal newborn reflex that causes toes to curl when the sole of the foot is touched. This reflex typically fades by 9-12 months. Occasional toe curling during standing or walking is also normal as babies figure out their balance. Persistent, tight toe curling past 12 months may warrant a mention to your pediatrician.