In India, the answer is 400 IU a day for the whole first year — and then, for a healthy child, the routine drops are meant to stop. IAP's revised 2021 guidelines recommend routine vitamin D supplementation of 400 IU/day in infancy (0–1 years), and do not recommend routine supplementation during childhood and adolescence, expecting the 400–600 IU/day requirement to be met from sunlight and dietary sources instead.
That is genuinely different from what your cousin in London or Toronto has been told, and it is the single most confusing thing about this supplement. Nobody hands you a stop date along with the bottle.
Not medical advice — consult your pediatrician before starting, stopping or changing any supplement.
The Dose by Age, and Who Says What
The disagreement is real, and it starts at the first birthday.
| Age | Indian Academy of Pediatrics | AAP (United States) | NHS (United Kingdom) |
|---|---|---|---|
| Birth to 12 months | 400 IU a day, routinely | 400 IU a day | 8.5–10 micrograms a day for breastfed babies |
| 1 to 4 years | No routine supplement for a healthy child; 400–600 IU a day from sun and food | 600 IU a day | 10 micrograms a day, as a supplement |
| Older children | Same — sun and diet, not routine drops | 600 IU a day | — |
For the first year, everyone agrees. IAP recommends routine supplementation of 400 IU/day in infancy, and AAP puts the requirement for babies younger than 12 months at 400 IU of vitamin D each day. The NHS, passing on UK Department of Health advice, asks for 8.5 to 10 micrograms a day from birth for breastfed babies.
After that, the paths split. AAP says toddlers, older children and adolescents need 600 IU of vitamin D each day, and MedlinePlus lists the same figure — 600 IU for children aged 1 to 13 years, against 400 IU from birth to 12 months. The NHS goes further and asks for a daily 10-microgram supplement for every child aged 1 to 4 — which is exactly why parents abroad are still buying drops for a four-year-old.
India's position is not that toddlers need less. It is that the same 400–600 IU should come from sunlight and food rather than a bottle. IAP reserves routine supplementation past infancy for children with specific high-risk conditions — things like chronic kidney or liver disease, malabsorption, non-ambulatory conditions, or long-term steroid and anti-epileptic use.
And one more thing worth knowing before you argue with anyone at a family lunch: WHO's own evidence library still records no recommendation on routine vitamin D supplementation for infants, saying further research is needed before specific recommendations can be made. This is an area where good bodies read the same evidence differently.
Why the First Year Is Not Negotiable
The reason infancy gets a universal recommendation is simple. Human milk is often very low in vitamin D, which is why all breastfed infants are advised to receive 400 IU of vitamin D daily. A newborn has no other reliable route to it.
If you have been irregular with the drops in that first year, that is a separate question with a reassuring answer — we covered it in missed vitamin D drops and how to restart safely.
The Sunshine Paradox, Briefly
India has the sun. Indian children are still often short of vitamin D.
A 2025 cross-sectional study of children aged 9 months to 12 years in western India found 34.7% deficient and 43.0% inadequate, and noted that India, despite high solar irradiance, reports widespread paediatric hypovitaminosis D — the proposed causes being reduced midday outdoor activity, sun-avoidant behaviour, clothing norms, skin pigmentation limiting UVB penetration, atmospheric pollution and urban living. Every one of those fits a city childhood: daycare indoors, 11am to 3pm spent anywhere but outside, and an air quality index that keeps the balcony door shut.
So "just put him in the sun" is not a plan. A 2024 review in the Indian Journal of Medical Research calls vitamin D deficiency highly prevalent in Indian children and relying on sunlight not a pragmatic solution.
IAP does still put numbers on it. IAP recommends daily sun exposure of 17–30 minutes in infants and 30–45 minutes in older children over 15–40% of body surface area, at least five times a week, between 11am and 3pm. Read that against your actual week. (On squaring it with sun protection, see sunscreen and sun safety for babies in India.)
What Food Actually Contributes Once They Eat Family Meals
Less than you would hope, and this is the part parents underestimate.
IAP is explicit that foods rich in vitamin D may not contribute sufficiently to meet vitamin D requirements, while still encouraging them as part of a balanced diet, vegetarian or non-vegetarian. The NHS puts it the same way: vitamin D is only found in a few foods, such as oily fish and eggs, and it is difficult to get enough vitamin D from food alone.
Fortified products are the realistic route. AAP suggests looking for foods fortified with vitamin D such as milk, cereal, orange juice, yogurt and margarine — in Indian aisles that mostly means fortified toned milk, fortified cooking oil and some breakfast cereals. The same Indian Journal of Medical Research review argues that fortifying items virtually everyone uses, like milk or cooking oil, would be ideal for India. Check the pack — the "+F" fortification logo is there for a reason.
More Is Not Better: The Safety Ceiling
Vitamin D is not a vitamin you can take casually in large amounts. MedlinePlus notes that vitamin D is fat soluble, meaning the body stores it rather than flushing out the excess.
The ceilings are published. A 2019 narrative review in Endocrine Connections tabulates tolerable upper intake levels of 1000 IU a day for infants aged 0–6 months, 1500 IU a day at 6–12 months and 2500 IU a day for children aged 1–3 years, a UL being the highest average daily intake likely to pose no risk of adverse health effects. IAP adds that doses above 400 IU do not offer any additional skeletal benefit during childhood, and that higher doses such as 1600 IU daily or above can result in toxicity.
This is not a theoretical Indian risk. A 2019 prospective study at a tertiary care centre in Kashmir, published in the Indian Journal of Endocrinology and Metabolism, found toxicity resulting from inadvertent use of vitamin D in mega-doses — repeated 600,000 IU injections, a median cumulative dose of 4,200,000 IU, and nephrocalcinosis in 18.7% of patients. High-dose sachets and injections circulate freely here; they are not a parent's call to make.
So: do not stack products. The NHS warns that having too much of some vitamins can be harmful, and specifically not to give two supplements at the same time — cod liver oil plus vitamin drops, for instance, because cod liver oil also contains vitamins A and D. And if your pediatrician has set a dose for your child, that dose is theirs to change, not yours.
Testing: Usually Not the Starting Point
Indian labs will happily run a 25(OH)D level on a toddler. That does not mean it is indicated. IAP states plainly that routine screening of apparently healthy children for vitamin D deficiency is not recommended, and that asymptomatic children should be screened only if they are at risk — for example those on long-term anticonvulsants or glucocorticoids, or with chronic kidney disease, malabsorption, disabilities or chronic inflammatory disease. Diagnosis and monitoring belong with your pediatrician, not with a walk-in panel.
What to Actually Do
- Through the first year: give the daily drops, every day, at the 400 IU a day IAP recommends for infancy.
- At the first-birthday visit: ask directly whether the drops stop now or carry on, and at what amount. Write the answer down. This is the conversation nobody initiates.
- If you are following Indian guidance: treat sun and fortified food as the actual plan, not a hope.
- If your pediatrician continues supplementation: that is a defensible choice too — it matches AAP's 600 IU a day for toddlers and older children and UK practice. Follow their instruction.
- Only one vitamin D product at a time: the NHS is explicit about not giving two supplements together.
- Keep the bottle out of reach: accidental high-dose ingestion is a documented cause of vitamin D toxicity in young children.
Iron is a separate story with separate rules — see iron supplement drops for babies in India if that is also on your list.
The honest summary: for the first year, 400 IU a day is settled. After that, India's pediatric body and the UK and US bodies genuinely differ, so the right amount for your 18-month-old is a short, specific question for your pediatrician — and now you know enough to ask it properly.
