Iron deficiency is the most common nutrient shortage in babies and toddlers worldwide, but the encouraging news is that it's preventable and easily treated once caught. Research suggests your pediatrician should check your baby's iron levels around 12 months old, especially if your baby was born early or seems sluggish. Catching low iron early makes a real difference in how your baby develops. If iron deficiency is found, it's typically fixed with iron-rich foods (like meat and beans) or supplements. The key is getting screening done so you know where your baby stands. If you're concerned about your baby's energy, growth, or development, asking your doctor about iron screening is a straightforward step that could give you important answers.