What to know about vitamin D deficiency in children

Children may have a higher risk when they have little outdoor exposure, limited dietary sources, darker skin, problems absorbing nutrients, or medicines that affect vitamin D. Possible signs include bone or muscle discomfort, weakness, delayed motor progress, or difficulty with movement, although these signs can have other causes.

A clinician considers age, growth, diet, medical history, and examination findings. Testing may be recommended when the history or examination suggests deficiency. Do not use an adult supplement or borrow another child’s prescription.

Keep regular health visits and mention restricted diets, digestive problems, limited outdoor time, or ongoing medicines. Offer a varied diet appropriate for the child’s age and follow local sun-safety guidance. If a supplement is advised, use the child-specific product and instructions exactly.

Store supplements out of reach and check labels before combining products. Arrange the recommended follow-up so the clinician can review growth, symptoms, and the response to treatment. Read [Vitamin D Deficiency](/conditions/vitamin-d-deficiency/) for general background.

Arrange prompt medical review for persistent bone pain, muscle weakness, unusual difficulty walking, repeated falls, or concerns about growth or development. Seek urgent help if a child has severe weakness, breathing difficulty, confusion, a seizure, or a significant injury.

Ask whether the child needs testing, which foods or supplement are suitable for their age, how much to give, and when to return. Ask whether another condition could explain the symptoms or whether siblings need separate advice.