Synopsis
Prescribe age-appropriate vitamin D and A, C and D supplements, recognise when formula already supplies enough, prevent duplicate dosing, distinguish routine prevention from treatment of deficiency, and adapt plans for prematurity, restricted diets and malabsorption.
- First-line prevention for a breastfed infant is a daily vitamin D supplement containing 8.5–10 micrograms from birth, even when the breastfeeding parent takes vitamin D.
- A formula-fed infant does not need additional vitamin D while taking at least 500 mL formula daily, because infant formula is fortified; start drops when intake falls below this threshold.
- Children aged 6 months to 5 years should receive daily vitamins A, C and D unless they consume at least 500 mL infant formula daily; children aged 1–4 years need 10 micrograms vitamin D daily.
- After age 4, advise 10 micrograms vitamin D daily during autumn and winter; children with little sun exposure or dark skin may need it throughout the year under UK advice.
- Check the label in micrograms: 10 micrograms vitamin D equals 400 international units. Use one age-appropriate product and avoid simultaneous multivitamin and vitamin D preparations unless prescribed.
- Healthy Start vitamin drops provide A, C and D for eligible families and may also be locally available universally; help the family obtain them rather than giving advice alone.
- Vitamin K given after birth prevents vitamin K deficiency bleeding and is a separate intervention; it does not replace daily vitamin D or A, C and D drops.
- Healthy term infants do not routinely need medicinal iron drops. From around 6 months, provide iron-rich complementary foods; use a prescribed neonatal plan for preterm or low-birth-weight infants.
- Vitamin B12, iodine, iron and calcium need explicit review in vegan or highly restricted diets. Dietitian input is preferable to improvised high-dose supplementation.
- When deficiency or rickets is suspected, investigate and treat using a paediatric therapeutic regimen. Routine preventive doses are not adequate treatment, and high-dose products should not be used without supervision.
Key red flags
Seizures, apnoea, stridor, tetany, carpopedal spasm or arrhythmia requires emergency assessment for hypocalcaemia and other metabolic causes.
Poor growth, bone pain, delayed motor development, muscle weakness, widened wrists, bowed legs or a persistently wide fontanelle raises nutritional rickets.
Prolonged jaundice, pale stool, dark urine, chronic diarrhoea or steatorrhoea suggests cholestasis or malabsorption and makes routine oral dosing unreliable.
Prematurity, very low birth weight, prolonged parenteral nutrition or complex neonatal disease requires the neonatal discharge regimen rather than a generic healthy-term schedule.
A restricted vegan diet without a reliable vitamin B12 source risks irreversible neurological injury; assess the breastfeeding parent's intake as well as the infant's.
Repeated vomiting, constipation, polyuria, dehydration or lethargy in a child receiving several supplements raises vitamin D toxicity and hypercalcaemia.
Investigation priorities
Determine whether routine prevention is correct and detect omitted or duplicate dosing.
Management branches
An infant receives breast milk, including mixed feeding with less than 500 mL formula daily.
- Choose an age-appropriate preparation supplying 8.5–10 micrograms vitamin D daily.
- Demonstrate the exact measured dose and check no other product duplicates it.
- At 6 months, use an appropriate A, C and D preparation and review diet and formula volume.