The Food and Drug Administration is warning consumers not to use certain powdered infant formulas made at Abbott Nutrition’s Sturgis, Michigan, facility amid an investigation into four infant illnesses.

Parents should discard any affected formula, according to the agency. Specifically, the FDA is advising consumers not to use Similac, Alimentum or EleCare powdered infant formulas if: the first two digits of the code are 22 through 37, and the code on the container contains K8, SH or Z2, and the expiration date is 4-1-2022 (APR 2022) or later.