Most toddlers weigh between 20 and 35 pounds, depending on their age and sex. At 12 months, the average child weighs around 20 to 22 pounds. By their third birthday, that number climbs to roughly 28 to 34 pounds. But the range of what’s perfectly healthy is wide, and your child’s growth pattern matters more than any single number on the scale.
Average Weight by Age and Sex
Toddlerhood spans from about 12 months to 36 months, and weight changes significantly across that window. Here’s what typical weights look like at key ages, based on the 50th percentile on CDC and WHO growth charts:
- 12 months: Girls average about 20 pounds; boys average about 21 pounds.
- 18 months: Girls average about 23 pounds; boys average about 24 pounds.
- 24 months: Girls average about 26 pounds; boys average about 28 pounds.
- 36 months: Girls average about 30 pounds; boys average about 31 pounds.
These are midpoint values. A child at the 5th percentile might weigh several pounds less, while one at the 95th percentile might weigh several pounds more, and both can be completely healthy. The normal range is broad by design.
Why Weight Gain Slows After the First Year
If your toddler seems to barely gain weight compared to their first year, that’s expected. Babies often put on 4 pounds in just four months during infancy. During the entire second year of life, most children gain only 3 to 5 pounds total. That dramatic slowdown often catches parents off guard, but it reflects a natural shift. Toddlers are more active, their growth rate decelerates, and their appetite can become unpredictable from day to day. It’s common for a toddler to eat enthusiastically one day and barely touch food the next.
What Shapes a Toddler’s Weight
No single factor determines where your child falls on the growth chart. Genetics play a large role: children inherit tendencies toward certain body types from their parents, and a child with smaller parents will often track along a lower percentile. That’s not a problem. It’s their normal.
Beyond genetics, nutrition, activity levels, and environment all contribute. Toddlers who eat mostly processed or fast food tend to gain weight more easily than those eating home-cooked meals, and screen time can replace physical activity even at this young age. Children are also naturally good at regulating their own hunger and fullness cues. Pressuring a toddler to finish everything on their plate can override those internal signals over time.
Certain medical conditions can also affect weight. Hormone disorders, low thyroid function, and some medications like steroids can increase appetite and promote weight gain. On the other end, chronic illness or feeding difficulties can slow growth. These situations are relatively uncommon, and a pediatrician will flag them if the growth pattern looks unusual.
How Pediatricians Track Growth
Your child’s doctor doesn’t just look at a single weight measurement. They plot your child’s weight on a growth chart at every visit, creating a curve over time. For children under 2, pediatricians in the U.S. use the WHO growth standards, which are based on healthy breastfed infants from multiple countries. After age 2, they switch to the CDC growth charts, which track children through age 20.
The percentile itself matters less than the pattern. A child who consistently tracks along the 15th percentile is growing normally for their body. A child who drops from the 75th percentile to the 15th percentile over a few visits is showing a change that needs investigation, even though 15th percentile is technically “normal.” Similarly, a rapid jump upward across percentile lines can signal a concern.
For children under 2, the WHO defines low weight-for-length as falling below the 2nd percentile, and high weight-for-length as above the 98th percentile. Starting at age 2, the CDC uses BMI-for-age categories: below the 5th percentile is considered underweight, and the 85th to 95th percentile range is considered overweight.
How to Weigh Your Toddler at Home
Getting an accurate weight at home is straightforward once you know the technique. If your toddler can stand still on a scale, have them remove their shoes and any heavy clothing, then stand in the center of the scale. Use a digital scale placed on a hard, flat surface rather than carpet. Spring-loaded bathroom scales are less reliable.
If your toddler won’t stand still (which is most toddlers), use the subtraction method: weigh yourself alone first, then step back on the scale while holding your child. Subtract your weight from the combined number. For example, if you weigh 150 pounds alone and 173 pounds holding your child, your toddler weighs about 23 pounds. Take each measurement at least twice to make sure you’re getting a consistent number, and record the weight to the nearest tenth of a pound.
Keep in mind that home measurements are useful for general tracking but aren’t a substitute for the calibrated scales at your pediatrician’s office. Small differences in scale accuracy, clothing, or time of day can shift the number by half a pound or more.
When Weight Falls Outside the Typical Range
A toddler who is consistently lighter or heavier than average isn’t necessarily unhealthy. What matters most is whether they’re following their own growth curve, eating a variety of foods, staying active, and meeting developmental milestones. A 2-year-old who weighs 24 pounds and has always tracked along the 10th percentile is in a very different situation than one who was at the 50th percentile six months ago and has dropped to the 10th.
If your child’s weight seems unusually high or low, or if their growth pattern has shifted noticeably, their pediatrician will typically start by reviewing diet and activity, checking for underlying medical causes, and monitoring more frequently before recommending any intervention. For most toddlers, the answer is simply that kids come in all sizes, and the growth chart reflects that natural variation.