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The short version
- Toddler appetite really does swing from meal to meal and day to day. The AAP calls it "erratic and unpredictable."
- In a classic study, preschoolers' intake varied about 34% from meal to meal but only about 10% across whole days.
- Aim for a balanced week, not a balanced day: offer regular meals and snacks and let your child decide how much.
- Call your pediatrician if low appetite comes with weight loss, illness or fewer wet diapers, or if your child refuses most meals for several days.
Is it normal for a toddler’s appetite to swing like this?
Yes. The American Academy of Pediatrics describes toddlers’ eating habits as “erratic and unpredictable from one day to the next.”2 A one-year-old, it says, may eat everything in sight at breakfast and almost nothing for the rest of the day, or eat about 1,000 calories one day and noticeably more or less over the next day or two.2
What matters is the bigger picture. The AAP’s advice is that your child’s diet will balance out over several days, as long as you keep offering a range of wholesome foods.2 One feast day followed by a famine day is a normal toddler rhythm, not a warning sign.
What the research shows: children balance meals, not single plates
The best-known study on this was published in the New England Journal of Medicine in 1991. Researchers measured everything that 15 children aged 2 to 5 ate over 24 hours, on six separate days, across three meals and three snacks a day.1
| Measured over | Average variation |
|---|---|
| A single meal or snack | 33.6% |
| A whole day | 10.4% |
Individual meals were all over the place. But each child’s total for the day was fairly steady, because a big meal was usually followed by a small one, and vice versa.1 In other words, children were adjusting at the next meal without anyone telling them to.
Other experiments from the same research group show the same instinct at work. When preschoolers were given a higher-calorie snack, they ate less afterward than when the snack was lower in calories.10
A toddler who eats “nothing” at dinner has often already eaten their share of the day.
This is worth remembering when a day looks like nothing. Usually you’re judging from the meals you watched. Milk, a snack at daycare, or the crusts eaten in the car all count, and they often fill the gap.
Why toddler appetite changes so much
- Growth slows down. Babies typically triple their weight in the first year; after that, growth and appetite both slow.4 A toddler genuinely needs less food than their baby self did.
- Needs are smaller than you’d guess. The AAP’s rule of thumb is about 40 calories per inch of height a day for ages 1 to 3, and it varies with build and activity — most toddlers land near 1,000 calories.3 A toddler serving is roughly a quarter of an adult’s.3
- One meal affects the next. The AAP points out that a child who ate a big breakfast or lunch may not be interested in eating much for the rest of the day.4
- Food preferences come and go. A toddler’s favorite food one day may hit the floor the next, and some eat the same food for three days running before rejecting it entirely.42
What about growth spurts?
Parents often describe hungry stretches that seem to come before a burst of growth, and over the long run appetite does follow growth. But we couldn’t find good research linking a single ravenous day in a toddler to a growth spurt. The practical advice is the same either way: serve a bit more when they ask for it, and don’t worry when the hungry phase ends. The appetite surge before puberty is better documented — see why preteens are always hungry.
How to feed a toddler whose hunger won’t sit still
The approach most feeding specialists recommend is dietitian Ellyn Satter’s Division of Responsibility: you decide what food is offered, when and where, and your child decides whether to eat and how much.6 It fits a swinging appetite well, because it doesn’t depend on any one meal going right.
A balanced week, not a balanced day
- Keep a predictable rhythm. Three meals and one or two snacks a day, at roughly the same times.8 Satter’s advice is regular meal and snack times, with no food or drink handouts in between, so hunger can build for the next meal.6
- Serve small portions. A tablespoon or two of each food, and more if they ask.3
- Don’t chase a low day. No “three more bites.” In a controlled study, preschoolers ate more and made fewer negative comments when they weren’t pressured to finish their food.7
- Don’t cap a hungry day. If your child wants seconds of a healthy meal, let them. The same internal sense that says “enough” says “more.”
- Judge over days. As one AAP pediatrician puts it, kids don’t need a balanced meal at every meal; what matters is balance over a day or two.5
The AAP also advises parents of two-year-olds to try not to fixate on the amounts their child eats, and to focus on eating together and offering healthy choices.8
If the low days tend to land at the evening meal, our guide to what to do when a toddler won’t eat dinner has seven things to try. If you’d like a sense of what a typical day adds up to, see what a 2-year-old should eat in a day and how many snacks a toddler should have.
When to worry
Most parents who worry that their child eats too little have a child who is eating normally for their age. A 2015 review in Pediatrics notes that while many young children are thought by their parents to eat poorly, most are only mildly affected, and only a small percentage have a serious feeding disorder.9 It also stresses that pediatricians should take every parent’s concern seriously, so don’t hesitate to ask.
Call your child's doctor if your child
- Is losing weight, or has dropped off their usual growth curve
- Has a poor appetite along with fever, vomiting, diarrhea or other signs of illness
- Has fewer wet diapers or is peeing much less than usual
- Has been refusing most meals for several days
- Seems unusually tired, pale or irritable
If your child is two and simply seems to eat very little overall, see what’s normal for a 2-year-old who isn’t eating much. If growth is your main concern, our guide to a toddler not gaining weight explains how pediatricians read the growth chart.
Common questions
Is it normal for a toddler to eat a lot one day and barely anything the next?
Yes. The American Academy of Pediatrics describes toddlers' eating as erratic and unpredictable from one day to the next, and says a child's diet will balance out over several days if a range of healthy foods is available.
Why is my toddler's appetite so up and down?
Growth slows after the first birthday, so toddlers need less food than babies, and they adjust how much they eat from meal to meal. A big breakfast often means a small lunch. Activity, sleep, snacks and milk all shift hunger too.
Do toddlers eat more during growth spurts?
Many parents notice hungry stretches, and appetite does follow growth over the long term. But there's little good research tying a single ravenous day to a growth spurt, so it's best to follow your child's hunger rather than try to predict it.
Should I make my toddler eat when they're not hungry?
No. Research has found that preschoolers eat more and say fewer negative things about food when they aren't pressured. Offer meals and snacks at regular times and let your child decide how much to eat.
When should I worry about my toddler's appetite?
Call your pediatrician if a poor appetite comes with weight loss, fever or other signs of illness, fewer wet diapers, or tiredness, or if your child has been refusing most meals for several days.
Sources
- Birch LL, et al. N Engl J Med. 1991;324(4):232–5. The variability of young children's energy intake.
- American Academy of Pediatrics, HealthyChildren.org. Feeding & Nutrition Tips: Your 1-Year-Old.
- American Academy of Pediatrics, HealthyChildren.org. Serving Sizes for Toddlers.
- American Academy of Pediatrics, HealthyChildren.org. 10 Tips for Parents of Picky Eaters.
- McCarthy C. American Academy of Pediatrics, HealthyChildren.org. Beyond Chicken Nuggets: Protein-Rich Alternatives for Picky Eaters.
- Ellyn Satter Institute. Division of Responsibility in Feeding.
- Galloway AT, et al. Appetite. 2006;46(3):318–23. 'Finish your soup': counterproductive effects of pressuring children to eat on intake and affect.
- American Academy of Pediatrics, HealthyChildren.org. Feeding & Nutrition Tips: Your 2-Year-Old.
- Kerzner B, et al. Pediatrics. 2015;135(2):344–53. A practical approach to classifying and managing feeding difficulties.
- Johnson SL, McPhee L, Birch LL. Physiol Behav. 1991;50(6):1245–51. Conditioned preferences: young children prefer flavors associated with high dietary fat.
This article is for general information and isn't a substitute for advice from your child's doctor. Our editorial standards.
