A healthy, well balanced diet is so difficult to achieve for adults nowadays, let alone children. Children have a very different biology from adults. It is not as simple as feeding them whatever you eat in smaller portions. Add on the fact that we try to specifically target bone growth for children. What we are often left with is well-meaning parents scratching their heads trying to figure out what to feed their kids. If you suspect your child isn’t growing up well, you can always bring them to visit a doctor that specialises in bones such as an orthopaedic surgeon.
Well fear not! I will educate you on the matter, and hopefully your children will love you even more for taking care of them(they should)!
1) Calcium from fortified foods
Fortified foods are usually staple foods that you consume such as rice or cereal that have been artificially modified to include additional healthy minerals. Do not be frightened by the word artificial. However, just because foods do not naturally contain… calcium, does not mean that it is bad that calcium is added to it. Usually fortified foods are made in an attempt to solve public health crises. For example, if the whole population of Singapore lacks Vitamin B, it makes sense to add it to food products. This helps prevent malnutrition?
With all that said, look out for calcium that is usually included in some fortified foods. Calcium is essential for healthy bone development. This is especially true for children, whose bones are still growing. Other sources include milk, soy milk, yoghurt, eggs and dark green leafy vegetables. You can consider looking at supplements as well.
2) Vitamin D
Unfortunately it is very difficult to get our daily intake of Vitamin D from food sources. Simply make sure your child gets some sun occasionally. This is especially easy in Singapore, where the sun shines brightly whether you like it or not. Not getting enough sun means that your child would be at risk of depression and osteoporosis.
Those especially at risk are usually the young. Consider Vitamin D supplements (children’s dose). This ensures your child does not suffer from Vitamin D deficiency. If they have been receiving moderate doses of sunlight though, you should not have to worry.
Vitamin D promotes calcium absorption in the gut. It also helps maintain strong bones.
3) Vitamin A
This section on Vitamin A is not going to tell you to find sources of Vitamin A, but rather warn you that overconsumption of Vitamin A will lead to hypervitaminosis A. Too much Vitamin A will lead to weaker bones and thus osteoporosis, and can also lead to hair loss. Control your intake of Vitamin A, especially if you like eating livers(hopefully from animals and not humans). Livers are rich in Vitamin A. Most children, however, are unlikely to enjoy them.
4) Magnesium
Magnesium is essential to bone growth just like calcium. Thankfully, it is available in certain types of fortified foods just like calcium, or other sources such as a banana. Bananas are rich in potassium as well and can help with muscle cramps! However, since it is difficult to obtain the necessary daily intake of magnesium, it is recommended that you consider looking at supplements to meet your child’s nutritional needs.
To fully describe the chemical processes that happen that can be attributed to magnesium would be impossible. A myriad of biochemical reactions happen due to magnesium, and one of them happen to be promoting the absorption of calcium and all of this adds up to ensure your bones and teeth are strong and firm.
Diet recommendation.
Something worth mentioning is that excess consumption of calcium without ample amounts of magnesium and excess consumption of magnesium without ample amounts of calcium can actually be detrimental to your bone metabolism and health, and can lead to osteoporosis. Be sure to take both in adequate quantities, as both are essential minerals that are necessary for bone growth and development in your child. Many buy into the rhetoric that is sold to us that as long as we consume calcium we will be fine, but modern day research has clearly and unequivocally shown otherwise.
5) Phosphorus — The Partner Mineral to Calcium
Phosphorus works closely with calcium to build and maintain bone mineral density. Approximately 85% of the body’s phosphorus is stored in bones and teeth, combined with calcium in the form of calcium phosphate crystals. Without adequate phosphorus, calcium cannot be properly incorporated into bone, regardless of how much calcium your child consumes.
Fortunately, phosphorus deficiency is rare because it is abundant in many common foods. High-phosphorus foods include dairy products, eggs, meat, fish, nuts, seeds, and legumes. Whole grains are also a moderate source. Children who eat a varied, balanced diet rarely need to specifically target phosphorus intake — it tends to take care of itself.
6) Vitamin K — The Underappreciated Bone Vitamin
Vitamin K is essential for activating osteocalcin, a protein that anchors calcium into the bone matrix. Without adequate vitamin K, osteocalcin remains inactive and calcium cannot bind properly to bone. Research consistently shows that children with higher vitamin K intake have greater bone mineral density and lower fracture rates.
Vitamin K is found primarily in leafy green vegetables — spinach, kale, broccoli, cabbage, and bok choy are excellent sources. It is also present in fermented foods such as natto (fermented soybeans), which is a particularly rich source of vitamin K2. Vitamin K2 is also found in some hard cheeses, egg yolks, and liver. Introducing a variety of green vegetables from an early age helps build the dietary habit that supports lifelong bone health.
7) Protein — Essential for Bone Structure
Protein provides the structural scaffold on which bone minerals are deposited. Approximately one-third of bone mass is composed of collagen, a protein that gives bone its flexibility and resistance to fracture. Children who are chronically protein-deficient have lower bone mass and delayed skeletal maturation. Adequate protein intake is particularly important during growth spurts and periods of intense physical activity.
Good protein sources for children include lean meats, poultry, fish, eggs, dairy, tofu, tempeh, legumes, and nuts. Protein intake recommendations vary by age — children generally need 0.8 to 1.5 grams of protein per kilogram of body weight per day, with higher needs during adolescence. A diet that includes protein at every meal supports bone development alongside the vitamins and minerals discussed above.
How Much Calcium Does My Child Actually Need?
Calcium requirements vary significantly by age. Infants under 6 months need 200mg per day; infants 7–12 months need 260mg. Children aged 1–3 years require 700mg per day; those aged 4–8 years need 1,000mg. From age 9 to 18 — the critical period of peak bone mass accumulation — the requirement rises to 1,300mg per day. Adults require 1,000mg per day.
One cup (250ml) of milk provides approximately 300mg of calcium. A serving of yoghurt or cheese provides a similar amount. Children who do not consume dairy need to obtain calcium from fortified plant milks, calcium-set tofu, canned fish with soft bones (sardines, salmon), sesame seeds, and green leafy vegetables. Parents of lactose-intolerant or vegan children should pay particular attention to calcium intake and may wish to consult a dietitian.
Foods and Habits That Harm Bone Development
Just as certain nutrients build bone, others can undermine it. Excessive salt increases urinary calcium excretion — the body loses more calcium through the kidneys when sodium intake is high. Processed snacks, instant noodles, fast food, and salty sauces are major contributors to high sodium intake in Singaporean children’s diets.
Carbonated soft drinks — particularly colas — have been associated with lower bone density in children who consume them frequently. The mechanism may involve the phosphoric acid displacing calcium from bone, or simply the displacement of calcium-rich beverages such as milk from the diet. Caffeine in cola drinks also increases urinary calcium loss. Limiting soft drinks to occasional treats rather than daily consumption is a practical protective measure.
Excessive screen time contributes indirectly to poor bone health by reducing outdoor physical activity and sun exposure (reducing vitamin D synthesis) and by displacing time that could be spent on weight-bearing exercise. Encouraging at least 60 minutes of active play outdoors daily addresses both vitamin D and mechanical loading simultaneously.
Frequently Asked Questions
Can my child get enough calcium without drinking milk?
Yes. While dairy is the most concentrated and bioavailable dietary calcium source, children who cannot or do not consume dairy can meet their calcium needs through calcium-fortified soy, oat, or almond milk, calcium-set tofu, canned sardines and salmon with soft bones, sesame seeds and tahini, and calcium-rich vegetables such as bok choy, kale, and broccoli. Regular monitoring of intake and consideration of supplementation may be advisable for children on strict dairy-free diets.
At what age is bone mass fully developed?
Peak bone mass is typically achieved between the ages of 25 and 30. However, approximately 90% of peak bone mass is accumulated by the end of adolescence. This makes childhood and teenage years the single most important window for dietary and lifestyle investment in lifelong bone health. The bone mass a person achieves during childhood and adolescence directly determines their fracture risk and susceptibility to osteoporosis in later life.
Should my child take a calcium supplement?
Most children who eat a varied diet containing dairy or fortified alternatives do not need calcium supplements. Supplementation should be considered for children with lactose intolerance or dairy allergy on unfortified alternatives, strict vegans, children with certain chronic illnesses affecting absorption (coeliac disease, Crohn’s disease), or children with prolonged poor appetite. Consult a doctor or registered dietitian before starting supplements — excessive calcium intake from supplements can impair absorption of other minerals such as iron and zinc.
How much sun exposure does my child need for vitamin D?
In Singapore’s equatorial location, even brief daily sun exposure produces significant vitamin D. Approximately 10 to 15 minutes of sun exposure to the arms and legs between 10am and 3pm, three to four times per week, is sufficient for most children with lighter skin. Children with darker skin may need slightly longer exposure. Sun protection (hats, shade, clothing) should still be used to reduce UV cancer risk — the balance is brief, regular exposure rather than prolonged unprotected sun bathing.
Practical Meal Ideas for Bone-Healthy Children
Translating nutritional knowledge into daily meals can be challenging for busy families. Here are some practical ideas that incorporate the key bone-building nutrients in child-friendly formats. For breakfast, oatmeal made with fortified milk topped with sesame seeds and sliced almonds delivers calcium, magnesium, and phosphorus. Scrambled eggs on wholegrain toast with a side of steamed broccoli provides protein, vitamin K, and vitamin D from eggs.
For lunch, a rice bowl with steamed tofu, bok choy, and a soft-boiled egg combines calcium-set tofu, vitamin K from the leafy greens, and protein. A sardine sandwich on wholegrain bread with sliced tomato offers calcium from the soft bones, protein, and vitamin D from oily fish. Evening meals built around salmon or mackerel, served with stir-fried green vegetables and brown rice, hit multiple bone-health targets simultaneously.
Healthy snacks for bone development include a small cup of yoghurt with mixed seeds, a handful of almonds, edamame, or a glass of fortified soy milk. Small, consistent contributions from each meal and snack throughout the day are more effective — and more realistic — than trying to meet the entire calcium requirement in a single serving.
Does exercise affect bone growth in children?
Yes — weight-bearing physical activity is one of the most powerful stimuli for bone formation in children. Activities that load the skeleton — running, jumping, skipping, climbing, gymnastics, and team sports — stimulate bone-forming cells called osteoblasts to lay down new bone. Children who are regularly physically active have measurably greater bone density than sedentary peers. Swimming and cycling, while excellent for cardiovascular health, are non-weight-bearing and do not provide the same bone-building stimulus — so they are best combined with some weight-bearing activity.
