Health condition
Vitamin D for children
Vitamin D keeps growing bones strong, and UK sunlight cannot reliably supply it - which is why national guidance recommends supplements for all young children, and why deficiency remains surprisingly common.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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UK advice: supplement drops for breastfed babies from birth (formula is already fortified), 10 micrograms daily considered for everyone over 4 in winter, and year-round for children with darker skin or little sun exposure
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Deficiency is usually silent; severe deficiency causes rickets - bowed legs, swollen wrists, delayed walking, bone pain and poor growth
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At-risk groups: darker skin, covered clothing, little outdoor time, exclusively breastfed infants without drops, and restricted diets
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Specialist: a consultant paediatrician for suspected rickets or confirmed significant deficiency, which is treated with higher-dose vitamin D and calcium review
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
Vitamin D is made in skin exposed to summer sunshine and is scarce in ordinary diets, and at UK latitudes the winter sun is simply too weak - so children's levels drift down from autumn to spring, most steeply in children with darker skin, children who spend little time outdoors, and breastfed babies whose mothers were themselves low. Mild deficiency has no visible symptoms, which is why the public health approach is routine supplementation rather than waiting for problems; severe prolonged deficiency softens growing bone, producing the bowed legs, swollen wrists and ankles, bone pain and faltering growth of rickets, a diagnosis that has never quite disappeared from UK practice.
Diagnosis and treatment routes
The practical prescription is straightforward and cheap: daily vitamin D drops for breastfed infants from birth, continued supplements through early childhood, and a lower threshold for year-round dosing in higher-risk groups - habits that cost pennies and prevent essentially all deficiency disease. Blood testing is reserved for children with symptoms, signs or risk factors rather than routine screening; confirmed deficiency is treated with several weeks of higher-dose vitamin D, dietary calcium is checked, and suspected rickets warrants paediatric assessment with X-rays and fuller metabolic bloods to confirm the cause and guide correction. In many parts of the UK, routine NHS referrals for this kind of problem currently take 20-45+ weeks, whereas an initial appointment with a private consultant is typically available within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a consultant paediatrician. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about Vitamin D for children.
Quick, plain-English answers to what people ask us most.
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Why is vitamin D important for children?
Vitamin D helps children absorb calcium and phosphate needed for healthy bone growth and development, and also supports normal immune function.
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What causes vitamin D deficiency in children?
Limited sun exposure, insufficient dietary intake, darker skin (which needs more sun for the same vitamin D production), and, in babies, exclusive breastfeeding without maternal or infant supplementation, are common contributing factors.
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What are the symptoms of vitamin D deficiency in children?
Many children have no obvious symptoms, but deficiency can cause bone pain, delayed growth, muscle weakness, and, in more severe or prolonged cases, rickets (softening and weakening of developing bones).
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Is vitamin D deficiency dangerous for children?
Prolonged, severe deficiency can cause rickets, leading to bone deformities and growth problems, so it's worth ensuring adequate vitamin D intake, particularly for higher-risk children.
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How much vitamin D do children need?
Recommendations vary by age and country, but UK guidance generally recommends a daily vitamin D supplement for babies from birth (particularly if breastfed) and for children up to age four, with government-recommended amounts detailed by national health guidance.
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Can vitamin D deficiency in children be treated?
Yes, vitamin D supplementation, with the dose tailored to the child's age and the severity of any deficiency, effectively corrects the deficiency and helps prevent or treat related bone problems.
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How long does treatment take to work in children?
With appropriate supplementation, vitamin D levels typically normalise within a couple of months, and any related bone symptoms usually start improving within weeks, though full bone healing in more severe cases like rickets can take longer.
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Vitamin D supplementation vs sunlight exposure - what's the difference?
Sunlight triggers natural vitamin D production in the skin but carries a balance of skin cancer risk with excessive exposure and isn't reliable in winter months in many climates, while supplementation provides a controlled, reliable dose; a combination of safe sun exposure and supplementation is often recommended for children.
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When should I speak to a doctor about my child's vitamin D levels, and how quickly can this be arranged privately?
Speak to your GP or health visitor if you're concerned about your child's vitamin D levels or bone development. Private paediatricians can typically arrange assessment within about one to two weeks.