Children need between 13 and 52 grams of protein per day, depending on their age and sex. A toddler’s needs are surprisingly modest, while a teenage boy requires roughly four times as much. The exact number shifts at each stage of development, so it helps to know both the daily totals and the per-pound logic behind them.
Daily Protein by Age Group
The U.S. Dietary Guidelines set these recommended daily amounts:
- Ages 1 to 3: 13 grams
- Ages 4 to 8: 19 grams
- Ages 9 to 13: 34 grams
- Ages 14 to 18 (girls): 46 grams
- Ages 14 to 18 (boys): 52 grams
These numbers look low to many parents, and that’s because they are relatively easy to hit. A single egg has about 6 grams of protein. Two tablespoons of peanut butter add 7 grams. A glass of milk provides 8 grams. A toddler eating a scrambled egg and a cup of milk at breakfast has already covered most of the day’s requirement.
Calculating by Body Weight
The age-based numbers above work for average-sized kids, but if your child is significantly smaller or larger than their peers, a weight-based calculation is more precise. International guidelines from the WHO, the European Food Safety Authority, and others converge on roughly the same figures: children need about 0.9 to 1.0 grams of protein per kilogram of body weight per day (or about 0.4 to 0.5 grams per pound).
Younger children need slightly more per pound because they’re growing faster relative to their size. Infants at six months need about 1.3 grams per kilogram. By age two, that drops to around 0.97 grams per kilogram, and by age four it settles to roughly 0.85 to 0.9 grams per kilogram, where it stays through adolescence. Boys and girls diverge slightly in the teen years, with boys needing a touch more per kilogram than girls.
A practical example: an 11-year-old who weighs 80 pounds (about 36 kilograms) needs roughly 33 grams of protein per day, which lines up neatly with the 34-gram recommendation for that age group. A 110-pound teenager needs about 50 grams.
What Active and Athletic Kids Need
Kids who play sports or train regularly don’t need as much extra protein as many parents assume. Strength and endurance training do increase protein needs slightly, but the key driver of muscle growth is the exercise itself, not extra protein on the plate. Most young athletes easily meet their needs through normal meals and snacks, especially if they’re eating more food overall to fuel their activity level.
A reasonable target for active kids ages 11 to 14 is about half a gram per pound of body weight per day, which for most children lands very close to the standard recommendation. Unless your child is on a severely restricted diet, the extra calories they eat to support their training typically bring enough protein along with them.
High-Protein Foods Kids Actually Eat
Hitting daily protein targets is easier than it sounds when you know the numbers behind common foods. Here’s what typical kid-friendly servings provide:
- 1 ounce of chicken, beef, or turkey: 7 grams (a child-sized portion of 2 to 3 ounces delivers 14 to 21 grams)
- 1 egg: 6 grams
- 1 cup of milk: 8 grams
- 5 ounces of Greek yogurt: 12 to 18 grams
- 6 ounces of regular yogurt: 5 grams
- 2 tablespoons of peanut butter: 7 grams
- 1 ounce of cheese: 7 grams
- 1 cup of soy milk: 7 grams
- 1 slice of bread: 3 grams
- 3/4 cup of cereal: 3 grams
Notice that protein adds up from unexpected sources. Bread, cereal, and pasta all contribute a few grams per serving. A toddler who eats a scrambled egg, a slice of toast, a cup of milk, a peanut butter sandwich, and a small serving of chicken over the course of a day gets well over 30 grams, more than double what they need.
When Protein Intake Falls Too Low
Severe protein deficiency is rare in developed countries, but mild shortfalls can still affect a child’s growth trajectory. The earliest signs tend to be subtle: fatigue, irritability, slow wound healing, and frequent infections as the immune system loses resources. Hair may become dry and brittle, skin can develop dry or flaky patches, and muscle development may lag behind peers.
In more extreme cases, protein malnutrition leads to a condition called kwashiorkor, which causes visible swelling in the feet, ankles, and belly due to fluid buildup. Children in this state often become apathetic and withdrawn. Their intellectual, neurological, and social development can fall behind, and some children never fully recover from the growth and developmental delays even after nutrition improves. This level of deficiency typically results from prolonged food insecurity or a severely restricted diet, not from a child being a picky eater for a few weeks.
Children most at risk for inadequate protein include those on very limited diets due to food allergies, those with chronic digestive conditions that impair absorption, and those in households experiencing food insecurity. If your child falls into one of these groups, tracking their protein intake for a few days can reveal whether they’re consistently falling short.
Risks of Too Much Protein
Parents sometimes worry about whether their child eats enough protein, but overloading is a more common issue in well-fed populations, especially when protein shakes, bars, or supplements enter the picture. Excessive protein intake stresses the liver and kidneys. The liver has to process the extra nitrogen that protein metabolism creates, and high levels of nitrogen make it harder for the liver to clear other waste and toxins. The kidneys, meanwhile, work harder to filter out the byproducts, which increases the risk of kidney stones and chronic dehydration.
Children’s organs are still developing, which makes them more vulnerable to these effects than adults. Protein supplements marketed to young athletes are rarely necessary and can push intake well beyond what growing bodies are designed to handle. Whole foods almost always provide enough protein without the risk of overconsumption, because the fiber, fat, and water in real meals create natural satiety signals that supplements bypass.
Plant-Based Diets and Protein Quality
Not all protein is created equal. Animal sources like meat, eggs, dairy, and fish contain all the essential building blocks (amino acids) that a growing body needs, in proportions that are easy to absorb. Plant proteins from beans, lentils, nuts, grains, and soy tend to be lower in one or more of those key amino acids, particularly the ones most critical for infant and child growth: leucine, lysine, and threonine.
This doesn’t mean plant-based diets are inadequate for children. It means they require a bit more planning. Eating a variety of plant proteins throughout the day, combining grains with legumes for instance, covers the full amino acid spectrum. Soy is the standout plant protein because its amino acid profile closely resembles that of animal protein. A cup of soy milk provides 7 grams of high-quality protein, making it a solid option for kids who don’t eat dairy or meat.
If your child follows a vegetarian or vegan diet, aiming slightly above the standard protein recommendation can help compensate for the lower digestibility of some plant proteins. An extra 10 to 15 percent, so roughly 1 gram per kilogram of body weight instead of 0.9, provides a comfortable margin.