Whether your baby needs vitamin D drops depends mostly on how they're fed and where you live. Breast milk contains only a small amount of vitamin D, so breastfed babies are the main group advised to have a supplement. In the UK, the NHS guide to vitamins for children advises a daily supplement of 8.5 to 10 micrograms for all breastfed babies from birth. In the US, the AAP and CDC advise 400 IU (10 micrograms) a day for breastfed and partly breastfed babies.
Australian national guidance is risk-based: supplements are for babies more likely to run low, such as exclusively breastfed babies with darker skin or little time outdoors. Formula has vitamin D added, so babies who drink enough of it usually don't need extra. This guide sets out each country's advice, how to give drops safely, what changes after 12 months, and where iron fits in. It doesn't replace the instructions on your product or from your pharmacist or doctor.
Does my baby need vitamin D drops?
| Where | Who is advised drops | Daily amount | Formula-fed babies |
|---|---|---|---|
| UK (NHS) | All breastfed babies, birth to 1 year | 8.5–10 micrograms | None if more than 500 mL formula a day |
| US (AAP) | All infants except those on enough formula, to 1 year | 400 IU (10 micrograms) | None if more than 27 oz (about 800 mL) a day |
| US (CDC) | Breastfed and partly breastfed, from shortly after birth | 400 IU | None if 32 oz (about 950 mL) or more a day |
| Australia (national) | Babies at higher risk; your doctor decides | Set by your doctor | Formula has added vitamin D |
| Western Australia (hospital) | All babies fed breast milk, until at least 6 months | 400 or 500 units | Formula-only babies generally don't need extra |
The Australian rows come from two kinds of source. Pregnancy, Birth and Baby, the Australian Government's parenting service, and the Royal Children's Hospital Melbourne fact sheet describe supplements for babies at risk of low vitamin D. The King Edward Memorial Hospital vitamin D handout from Western Australia's Women and Newborn Health Service goes further and recommends drops for all babies fed breast milk. Ask your GP, child-health nurse or midwife which advice your local service follows.
The RCH fact sheet is marked as awaiting routine review, and the US figures differ slightly between the AAP and the CDC on the formula threshold. Where sources differ, follow your own health service.
Why are breastfed babies more likely to need vitamin D?
Most vitamin D is made in the skin in sunlight, and only a small amount comes from food. Pregnancy, Birth and Baby in Australia says babies can make most of what they need from sunlight, but that breast milk doesn't contain much vitamin D. The Western Australian handout adds three reasons babies can run low in the first 6 to 12 months:
- they're born with only a small store of vitamin D, which can be used up quickly
- breast milk contains only a small amount
- babies are kept out of direct sunlight
The Royal Children's Hospital explains that a baby's first store comes from their mother, so a baby whose mother has low vitamin D may also be at risk. That's not a fault in your milk or your diet. The NHS still advises a supplement for breastfed babies whether or not you take vitamin D yourself.
Which babies are at higher risk?
Australia's Pregnancy, Birth and Baby and the Royal Children's Hospital list babies who:
- are exclusively breastfed
- spend a lot of time indoors, or are fully covered by clothing outdoors
- have darker skin
- were born prematurely
- were born to a mother with low vitamin D
If any of these apply, ask your GP or child-health nurse whether your baby should have drops. Pregnancy, Birth and Baby says time outdoors helps babies make vitamin D, but that it's still important to be sun-safe, with a hat and sunglasses to protect skin and eyes.
How much vitamin D do babies need, and how do I give drops?
The amounts in the table are what each health service advises, but the volume you give depends entirely on the product. The Western Australian handout explains that 400 units of vitamin D is the same as 10 micrograms, and that "units" may also be written as IU. Its own list of products available in Australia shows how much strengths vary: one gives 400 units in a single drop, another 400 units in 1 mL. A "drop" or "mL" from one bottle is not the same as from another.
To give drops safely, Pregnancy, Birth and Baby and the Western Australian handout suggest:
- Check the product with your pharmacist or doctor, including the strength and how much to give.
- Measure with the dropper or oral syringe that comes with the product, never a kitchen teaspoon.
- Give it straight into your baby's mouth, aiming for the inside of the cheek.
- Don't mix it into a bottle or food, because your baby may not finish it.
- If you miss a dose, follow the instructions on the pack or ask your pharmacist.
More isn't better. The NHS says too much of some vitamins can be harmful, and the Royal Children's Hospital says too much vitamin D can cause problems and that some products are very strong. If you think you've given more than the intended amount, the Western Australian handout says to get medical advice as soon as possible or contact a poisons information centre.
Does a formula-fed or combination-fed baby need vitamin D?
Infant formula has vitamin D added, so a baby who drinks enough of it gets what they need from their milk. The thresholds differ:
- UK: the NHS says babies having more than 500 mL (about a pint) of formula a day should not be given vitamin supplements.
- US: the AAP advises a supplement unless a baby drinks more than 27 oz (about 800 mL) of formula a day; the CDC's threshold is 32 oz (about 950 mL) or more.
- Australia: the Western Australian handout says babies fed only formula generally don't need extra vitamin D.
A combination-fed baby, or one whose formula intake is creeping up as they grow, may sit either side of these lines. Ask your GP, child-health nurse or pharmacist whether to keep going, and don't add a second product containing vitamin D without checking. Combination feeding and how much formula cover intake in more detail.
Do babies need vitamin D after 12 months?
Advice continues past the first birthday in the UK and the US:
| Where | Age | What's advised |
|---|---|---|
| UK (NHS) | 6 months to 5 years | Daily vitamins A, C and D, unless having more than 500 mL formula a day |
| UK (NHS) | 1 to 4 years | 10 micrograms of vitamin D a day |
| US (AAP, CDC) | Over 1 year | 600 IU (15 micrograms) a day |
In the UK, the NHS says you may be able to get free vitamin drops through Healthy Start. Once your child eats a range of foods, the CDC lists some fish such as salmon, eggs, and fortified foods such as yoghurt and cereals as sources of vitamin D, and pasteurised whole cow's milk from 12 months. See moving to cow's milk for the switch.
Do babies need iron drops as well?
Possibly, depending on where you live and how your baby is fed. The AAP says healthy full-term breastfed babies don't need added iron for the first 4 months. From 4 months, it recommends that breastfed and partly breastfed babies have an iron supplement of 1 mg per kg of body weight a day until iron-containing foods, including iron-fortified cereals, are part of their diet. It says iron may start in the first month for babies born prematurely or at a low birth weight.
Iron drops are a medicine, so let your baby's doctor choose the product and amount. In Australia and the UK, ask your GP or child-health nurse whether this advice applies to your baby. First foods and iron covers iron-rich foods from around 6 months.
What are the signs of low vitamin D?
Some babies with low vitamin D have no symptoms, according to Pregnancy, Birth and Baby. When there are signs, it lists:
- growing or developing slowly
- getting tired easily when active
- irritability
- muscle weakness, cramps or bone pain from low calcium
- seizures, which are uncommon and most likely under 12 months
Pregnancy, Birth and Baby explains that very low vitamin D over a long time can cause rickets, a bone deformity, and the Royal Children's Hospital describes rickets as soft bones. A doctor diagnoses low vitamin D with an examination and a blood test, and Pregnancy, Birth and Baby says babies being treated should have another blood test after 3 months.
When should I get help?
These seizure steps come from Australia's Pregnancy, Birth and Baby. Stay with your baby until the seizure stops.
Get medical advice as soon as possible (your GP, a health advice line (Pregnancy, Birth and Baby on 1800 882 436 in Australia, NHS 111 in the UK, your pediatrician's after-hours line in the US) or a poisons information service) if you think your baby has been given too much vitamin D.
Talk to your GP or child-health nurse at the next check if:
- you aren't sure whether your baby needs drops, or which product to use
- your baby has any of the risk factors above
- you're combination feeding and their formula intake is near the thresholds
- your baby seems to be growing slowly, is unusually tired or irritable, or you're worried about their bones
What's worth noting when you give drops?
Write down the product, its strength, the amount you were told to give and the time each dose is given. When more than one person looks after your baby, a shared note stops a dose being missed or given twice. Bring the product and your notes to appointments so your GP or pharmacist can check them.
