Toddler Not Gaining Weight: What's Normal, When to Call

After the fast growth of the first year, a toddler's growth rate and appetite both tend to slow down (AAP). What doctors care about most is the trend over time, not one number on the chart (AAP).

TL;DR

After age 1, many toddlers gain only about 3 to 5 pounds a year and often eat less.
Doctors judge the trend on the growth chart, not a single percentile.
Call the doctor if your child doesn't begin to gain weight as expected, loses appetite or is tired a lot.

See a daily energy estimate for your child, based on the National Academies' 2023 equations.

It is only an estimate: a child's real needs may vary considerably, which is why weight is watched over time (NASEM 2023).

Keeping a record with Sito

In Sito, you can save weight and height after each checkup. Entries are dated the day you save them, and a trend line appears after the second. From age 2, weight and BMI show a healthy-range band. Log meals by photo, barcode or search and see the day's calories and protein.

From age 2, the Gain goal raises the calorie target by 5%, or 15% when BMI-for-age is below the healthy range; under 2 it changes nothing. Those percentages are our setting, not a medical recommendation; the National Academies say their equations are not designed for weight-gain goals (NASEM 2023). A number from your doctor or dietitian can replace our estimate.

Keep weights and meals in one place

Save each checkup's weight and height, log meals by photo, barcode or search, and see the day's calories and protein.

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How much weight do toddlers normally gain?

Age	Typical gain per year	Source
1 to 2 years	About 3 to 5 lb (1.4 to 2.3 kg)	AAP; KidsHealth says about 5 lb
2 to 3 years	About 4 lb (1.8 kg)	KidsHealth
4 to 5 years	About 4 to 5 lb (2 kg)	KidsHealth; AAP says about 4 1/2 lb in the fifth year

At age 2, children need fewer calories because they are growing more slowly (AAP).

How doctors judge slow weight gain

In the US, the CDC recommends the WHO growth charts from birth to 2 and the CDC growth charts from age 2 (CDC). A few things matter more than where the dot lands:

The trend. One point isn't as useful as 5 data points over time, and the 10th percentile is no better or worse than the 90th (AAP).
Staying on a line. Children usually follow one percentile line. Moving off it might signal a problem, but changing percentiles doesn't always mean there's a problem (KidsHealth).
Time. If growth recently slowed, the doctor may track measurements over a few months (KidsHealth).

The AAP has replaced "failure to thrive," which it calls stigmatizing, with "faltering weight" (AAP). Its diagnostic criteria are z-score cutoffs written for doctors (Pediatrics 2026).

Common reasons a toddler isn't gaining

You might feel at fault, but lots of things can affect growth, and most are out of your control (Cleveland Clinic). KidsHealth lists these causes (KidsHealth):

Not enough calories, including trouble affording food
Eating too little, including very picky eating
Digestive problems (reflux, chronic diarrhea, celiac disease) or food intolerance
Ongoing medical conditions, infections or metabolic disorders

Too few calories is the most common cause (Cleveland Clinic), and sometimes no clear cause can be found (NICE).

When to call the doctor

KidsHealth says to call your doctor if your child (KidsHealth):

develops new symptoms like vomiting, diarrhea, or fever
doesn't begin to gain weight as expected
loses appetite
is tired a lot or doesn't have the energy to do everyday activities
misses developmental milestones like sitting up, walking, or talking

Go to the emergency room (ER) if your child:

is vomiting over and over again
isn't drinking at all or has signs of dehydration (not enough water in the body), like a dry or sticky mouth, sunken eyes, less pee or darker pee than usual, few or no tears when crying, or unusual sleepiness

Source: KidsHealth

For children aged 2 and over, the NHS suggests speaking to a GP or school nurse if:

you're worried your child is underweight
they've lost weight quickly without changing what they eat and drink
you're worried about their eating habits
you think they have a food intolerance or allergy
things you're trying yourself are not helping

Boston Children's also flags a child of any age who has been growing steadily and suddenly stops growing (Boston Children's).

What to track and bring to the appointment

Faltering weight is diagnosed with a detailed health history, including growth over time, and a physical exam; most of the time, lab work and tests are not needed (AAP). Helpful things to bring:

A food diary. Doctors may ask you to record food types and amounts plus mealtime issues like setting and behavior (NICE). Our food diary guide has a printable page.
Milk and juice amounts. The AAP suggests 16 oz of milk a day at 12 to 24 months, 16 to 24 oz at 2 to 5 years, and no more than 4 oz of juice at ages 2 to 3 (AAP). Milk is low in iron and can make children feel full (AAP). More on low iron in iron deficiency in children.
Questions about the growth chart. Ask to see it, and ask the doctor to help you understand what the growth trend shows (AAP).
Recent health changes, such as vomiting, diarrhea, fever or an illness, to mention in the health history (KidsHealth).
What meals look like. The doctor may ask about foods, snacks, coughing or gagging while eating, and access to food. Their goal is to help, not judge or blame you (Cleveland Clinic).

NICE advises clinicians to weigh usually no more than monthly from age 1, and warns that weighing more often than needed may add to parents' anxiety (NICE).

A food log is a record to share, not a verdict. Self-reported food records can't judge whether energy intake is enough; a normal rate of growth can (NASEM 2023).

Mealtimes without pressure

Your job is to offer food; your child decides whether to eat it. Pressure or punishment can make children actively dislike foods (AAP). What helps:

Relaxed meals eaten together, on a regular schedule such as 3 meals and 2 snacks a day (NICE)
No drinks or snacks before meals (NHS), since too many energy-dense drinks, including milk, can reduce appetite for other foods (NICE)

For energy-dense ideas, see high-calorie foods for toddlers.

Frequently asked questions

My toddler eats almost nothing. Is that normal?

It can be. Appetite slows as growth slows, and picky eating is often the norm for toddlers (AAP). If you're concerned your child isn't eating enough, speak with your doctor (KidsHealth).

How long does it take a toddler to catch up?

For a child with poor weight gain, it might be several months before they are back in the normal range (KidsHealth); Cleveland Clinic mentions about four to nine months of steady growth to catch up (Cleveland Clinic).

Is the 5th percentile underweight?

A percentile alone doesn't decide it. A baby at the 5th percentile can be just as healthy as one at the 95th (KidsHealth). From age 2, the CDC calls a BMI-for-age below the 5th percentile underweight (CDC), and the 2026 AAP guideline counts that line, measured as a z-score, among its criteria for doctors (Pediatrics 2026). Faltering weight is diagnosed with a health history, growth over time and an exam, so ask your child's doctor (AAP).

This article is general information, not medical advice. If you're worried about your child's growth, talk with your pediatrician.

Sources

A note from us: This article is for educational purposes and isn't medical advice. Sito is not a medical application and does not provide medical advice, diagnosis or treatment (our terms). Every child is different. For concerns about your child's growth, diet, or health, please talk to your pediatrician or a registered dietitian.

About the author: Berkay Yenilmez is the founder of Sito, the AI-powered kids nutrition tracker. We build our guidance on published AAP, CDC, NICE, NHS, KidsHealth and National Academies references, the same sources linked above.

Toddler Not Gaining Weight: What's Normal and When to Call the Doctor