Why Vitamin D Is One Nutrient Pediatricians Don't Ignore

By: Dr. Cindy Tung, MD, FAAP
Board-Certified Pediatrician

If there's one vitamin parents ask me about more than almost any other, it's vitamin D.

Maybe you've heard your pediatrician mention it during your baby's first checkup. Maybe you've seen it added to formula or milk at the grocery store. Or maybe you're wondering if your child actually needs it at all.

It's a fair question.

Most of the time, we encourage families to get nutrients from a balanced diet. Vitamin D is a little different.

Unlike many vitamins, it's surprisingly difficult to get enough from food alone. That's one of the reasons pediatricians pay close attention to it from infancy through adolescence.

What Does Vitamin D Actually Do?

Think of vitamin D as your body's helper.

Its biggest job is helping the body absorb calcium, which is essential for building strong bones and teeth. Without enough vitamin D, children can't use calcium as effectively, even if they're getting enough of it in their diet.

Vitamin D also supports normal muscle function and plays an important role in healthy immune function.

It's a small nutrient with a pretty big job.

Why Is Vitamin D So Commonly Discussed?

Children today spend less time outside than previous generations. Sunscreen, while incredibly important for protecting skin, also reduces the body's ability to make vitamin D from sunlight. During the winter months, many parts of the country simply don't get enough sunlight for consistent vitamin D production.

On top of that, very few foods naturally contain significant amounts of vitamin D.

Fatty fish, egg yolks, and fortified dairy products can help, but many children still don't consume enough through diet alone.

What About Babies?

Vitamin D becomes especially important during infancy.

Breast milk is the ideal source of nutrition for babies, but it doesn't naturally contain enough vitamin D to meet an infant's daily needs. Because of that, the American Academy of Pediatrics recommends that breastfed and partially breastfed infants receive 400 IU of vitamin D each day beginning shortly after birth.

Formula-fed babies may also need supplementation until they're consistently drinking enough vitamin D-fortified formula.

It's one of the earliest nutrition conversations pediatricians have with new parents, and for good reason.

Does Every Child Need a Vitamin D Supplement?

Not always.

Some children get enough vitamin D through a combination of fortified foods, diet, and sunlight. Others may benefit from supplementation based on their age, diet, medical history, or lifestyle.

There's no one-size-fits-all answer.

That's why routine well visits are so valuable. Your pediatrician can look at the whole picture, including growth, nutrition, and any individual risk factors, before making a recommendation.

Can You Get Too Much Vitamin D?

Yes.

Like many vitamins, more isn't always better.

Taking more than the recommended amount over time can lead to excessive vitamin D levels, which may cause health problems. That's why it's important to follow dosing recommendations and talk with your pediatrician before adding any supplement to your child's routine.

The Bottom Line

Vitamin D is one of the few nutrients pediatricians consistently pay close attention to because it supports healthy growth from the very beginning.

Not every child needs supplementation, but many do, especially during infancy or periods of rapid growth. If you're unsure whether your child is getting enough vitamin D, it's worth bringing up at your next well visit.

Like so much in pediatrics, the goal isn't perfection. It's making sure your child has what they need to grow, play, learn, and thrive.