ST. LOUIS (KSDK) - It's one of those things most mothers always make sure their kids do every day.
Drink their milk at every meal!
But a new study published in the journal Pediatrics is questioning the practice of making sure kids get three glasses a day.
After following 1,300 preschoolers, scientists found three glasses a day can help kids get enough vitamin D, but the levels of iron in their bodies dropped.
This is such a interesting finding we asked St. Louis Children's Hospital pediatrician Dr. Kathleen Berchelmann to come on First @ 4 and give us some guidance.
Click the video player above to hear what Dr. Berchelmann had to say.