U.S. baby formula shortage is worrying parents. Here’s what to know.

Nationwide out of stock levels for infant formula hit 43 percent last week

A production shutdown following a recall has resulted in nearly empty shelves of infant formula at a Kroger supermarket in Decatur, Ga. (Erik S Lesser/EPA-EFE/REX/Shutterstock)

For months, U.S. parents and caregivers have been contending with dwindling supplies of baby formula. But in recent weeks, the products have been especially hard to find, forcing some retailers to limit purchases as the Food and Drug Administration scrambles to respond to the crisis.

Roughly 1 in 4 parents exclusively breastfeed their children up to the age of 6 months, according to the national Centers for Disease Control and Prevention, leaving the overwhelming majority of parents and caregivers at least partially dependent on formula.

Here’s what you need to know about the baby formula shortage.