Does My Baby Need a Vitamin D Supplement?

Vitamin D plays an essential role in infant health — particularly for bone development, immune function and calcium absorption.

But in Australia, where sunshine is abundant, many parents understandably ask:

Does my baby really need a vitamin D supplement?

The answer depends on several factors — including feeding method, sun exposure and individual risk.

Here’s what current Australian recommendations say.

Why Vitamin D Matters for Babies

Vitamin D helps the body absorb calcium and phosphorus, which are critical for healthy bone mineralisation and skeletal development 1.

Severe vitamin D deficiency in infants can lead to rickets — a condition characterised by soft, weakened bones 2.

Vitamin D also supports immune system function and muscle health 1.

How Do Babies Get Vitamin D?

Babies can obtain vitamin D from three main sources:

• Sunlight exposure

• Breastmilk or infant formula

• Supplementation
  
  

Infant formula in Australia is fortified with vitamin D. That means babies consuming at least 500 mL of standard infant formula per day typically receive sufficient vitamin D from formula alone 4. 

However, the same can not be said for breastfed infants as vitamin D levels in breastmilk are generally low, even when maternal levels are adequate 3.

What Do Australian Guidelines Recommend?

According to The Royal Children’s Hospital Clinical Practice Guidelines and other Australian paediatric guidance, exclusively or partially breastfed infants who have one or more risk factors for vitamin D deficiency should receive 400 IU (10 micrograms) daily5.

Risk factors include:

• Darker skin pigmentation

• Limited sun exposure

• Living in southern regions of Australia (particularly during winter)

• Maternal vitamin D deficiency

• Cultural or clothing practices that limit sun exposure

• Medical conditions affecting vitamin D metabolism
  
  

The Australian and New Zealand Bone and Mineral Society also supports supplementation for at-risk infants 6.

What About Sun Exposure?

Australia has high UV levels, but sun exposure recommendations must balance vitamin D production with skin cancer risk.

The Cancer Council Australia advises that infants under 12 months should not be deliberately exposed to direct sunlight 7.

Because of this protective guidance, breastfed infants, particularly those with additional risk factors, may not receive sufficient vitamin D from sunlight exposure alone.

Should All Babies Automatically Supplement Vitamin D?

Routine universal supplementation is not currently mandated for all Australian infants. 

However, targeted supplementation for at-risk groups is strongly recommended 5,6.

If a baby is:

• Exclusively or partially breastfed

• Has limited sun exposure

• Or has identifiable risk factors

Vitamin D supplementation is generally advised.

How Much Vitamin D Does a Baby Need?

It is recommended that exclusively or partially breastfed infants who have one or more risk factors for vitamin D deficiency should receive 400 IU (10 micrograms) daily5.

This dose is considered safe and effective for maintaining adequate vitamin D levels in infancy.

If you are unsure whether your baby falls into a higher-risk category, your paediatrician or pediatric dietitian can provide personalised guidance.

A Simple Way to Support Vitamin D Levels

For families who require supplementation, a liquid vitamin D formula can allow for accurate, easy dosing in infants.

SolDrops is a vegan liquid vitamin D supplement that supports flexible dosing consistent with Australian clinical practice guidelines. Designed for ease of administration, it provides a simple way to help maintain healthy vitamin D levels during early life — particularly in exclusively or partially breastfed infants with one or more risk factors for deficiency.

Final Takeaway

Not all Australian babies require routine vitamin D supplementation — but many exclusively or partially breastfed infants with risk factors do.

Because breastmilk alone may not provide adequate vitamin D, and direct sun exposure is not recommended for infants, supplementation can be an important protective strategy.

If you’re unsure whether your baby needs vitamin D, a discussion with your healthcare provider can help clarify what’s appropriate for your family.

References

1. Australian Government National Health and Medical Research Council (NHMRC). (2017). Nutrient Reference Values for Australia and New Zealand – Vitamin D.
   
   

2. Munns, C. F., et al. (2016). Global consensus recommendations on prevention and management of nutritional rickets. Journal of Clinical Endocrinology & Metabolism, 101(2), 394–415.
   
   

3. Dawodu, A., & Tsang, R. C. (2012). Maternal vitamin D status: effect on milk vitamin D content and infant vitamin D status. Advances in Nutrition, 3(3), 353–361.
   
   

4. Food Standards Australia New Zealand (FSANZ). (2021). Infant Formula Products Standard 2.9.1.
   
   

5. The Royal Children’s Hospital Melbourne. (2023). Clinical Practice Guidelines: Vitamin D deficiency.
   
   

6. Nowson, C. A., et al. (2012). Vitamin D and health in adults in Australia and New Zealand: Position statement. Medical Journal of Australia, 196(11), 686–687.
   
   

7. Cancer Council Australia. (2023). Sun protection recommendations for infants and children.