Vitamin D for babies 0 to 12 months

Give your baby 5 micrograms of vitamin D3 as a supplement every day from birth to 12 months if they are:

  • breastfed
  • taking less than 300mls or 10 fluid oz (ounces) of infant formula a day

All babies who are being breastfed should continue to get a vitamin D supplement after birth, even if you took vitamin D during pregnancy or while breastfeeding.

You do not need to give your baby a vitamin D supplement if they are fed more than 300mls or 10 fluid oz (ounces) of infant formula a day. This is because there has been an increase in the amount of vitamin D added to infant formula. This is due to a change in EU law as of February 2020.

There are many suitable infant vitamin D3 supplements available to buy in Ireland. Use a supplement that contains vitamin D only.

Why babies need vitamin D

Vitamin D helps us to build and maintain strong bones and teeth.

Our bodies can make vitamin D from the sun. But babies cannot safely get the vitamin D they need from the sun.

Your baby needs vitamin D because:

  • their skin is very sensitive to the sun and should not be in direct sunlight
  • their food (breastmilk or solid foods) may not have enough vitamin D in it
  • between 0 to 12 months babies grow very quickly and have a greater need for vitamin D to form strong bones

Research shows that vitamin D plays an important role in helping the immune system. It may help prevent diabetes, heart disease, rheumatoid arthritis, MS (multiple sclerosis) and some forms of cancer.

African, Afro-Caribbean, Middle-Eastern or Indian parents are more likely to have babies with low levels of vitamin D.

Risks of low vitamin D levels

In severe cases, low-levels of vitamin D can cause rickets or osteomalacia in children.

Rickets is a condition that leads to soft bones. It can cause severe bone deformities such as bowed legs and spine curves.

Rickets in adults is known as osteomalacia or soft bones. This can cause frequent bone fractures, muscle weakness and bone pain.

Buying vitamin D3 supplements

You can buy vitamin D3 supplements for babies in pharmacies and some supermarkets. It is important that you buy supplements that are suitable for babies, and contain vitamin D3 only.


It is important that you buy supplements that are suitable for babies, and contain vitamin D3 only.

You don't need a prescription to buy vitamin D. The cost will vary depending on the supplement.

Vitamin D supplements for babies and children are not available on the medical card or any other government drug scheme.

Ask your pharmacist how many doses you will get from a supplement and how long it will last once open.

Depending on the supplement, you may need to buy more than one bottle in the year.

Giving your baby vitamin D

Check the label on your vitamin D3 supplement for the number of drops or amount of liquid you need to give your baby.

Read the instructions each time. You may need to give your baby the supplement in a different way with each new brand.

Give your baby the correct dose directly into their mouth.

One dose: 5 micrograms

The correct amount is 5 micrograms. The number of drops can vary, depending on the supplement you are using. If the dose is correct, there are no risks to babies.

Only give your baby one dose per day. Very large doses of vitamin D3 may make your baby ill.


Ask your pharmacist, GP or public health nurse if you're not sure what to do.

Vitamin D for children aged 1 to 4

Your child will need to take a vitamin D supplement after their first birthday. They should take it between Halloween (October 31st) and St Patrick's Day (March 17th).

Read about vitamin D supplements for children aged 1 to 4 years

Other vitamins

If your baby was premature or is getting on-going medical care, they might need extra vitamins or a higher dose of vitamin D3.

If your baby is taking other vitamins, ask your pharmacist, GP or public health nurse for advice.


Only give your baby multivitamins or higher doses of vitamin D3 if recommended by a healthcare professional.

Slaintecare logo
This project has received funding from the Government of Ireland’s Sláintecare Integration Fund 2019 under Grant Agreement Number 123.

Page last reviewed: 15 March 2018
Next review due: 15 March 2021