The shortage of infant formula in the United States is worrying parents. Here’s what you need to know.

For months, parents and caregivers in the United States have been struggling with a dwindling supply of infant formula. But in recent weeks, products have been hard to find, Forcing some retailers to limit purchases As the Food and Drug Administration struggles to respond to the crisis.

Nearly 1 in 4 parents exclusively breastfeed their babies until age 6 months, according to the National Centers for Disease Control and Prevention, leaving the vast majority of parents and caregivers at least partially dependent on formula.