Infant Formula Change
Important Notice: Beginning February 1, 2026, the Illinois WIC program will begin a transition from providing the Enfamil line of formula products from Mead Johnson to the Similac line of formula products made by Abbott. The process of switching to Similac formula will take place over three months. By May 1, 2026, all Illinois WIC families will have transitioned to the Similac line of formula products.
IDHS expects WIC Vendors to maintain stock of both Enfamil and Similac products during the transition period from February 1 - April 30, 2026, as participants will have benefits for both products during this time.
For more information about this change, please view our Illinois WIC Infant Formula Crosswalk (pdf).
If you have questions, please reach out to DHS.WICVendor@illinois.gov or 844-901-0962.
The Illinois WIC Program works with authorized grocery stores and pharmacies to provide healthy foods to families. This page is the starting point for everything you need to know about becoming and operating as a WIC Vendor.
- Becoming a Vendor - Learn who can apply and what requirements your store must meet.
- How to Apply - Step-by-step instructions to complete the vendor application process.
- Training - Information on required initial, annual, and cashier training.
- Operating as a Vendor - Day-to-day rules for transactions, stocking, pricing, and program integrity.
- Changes & Updates - How to report ownership changes, store moves, supplier updates, or voluntary withdrawal.
- IL WIC Vendor Handbook - The official handbook, incorporated into your WIC Vendor Contract.
- Vendor Tools & Communications - Notices, call minutes, reporting forms, and UPC submission requests.
- WIC Information for Manufacturers & Distributors - Quarterly redemption reports and instructions on how to submit product information for review to be added to the IL WIC Authorized Product List.
Contact Us
If you have questions or need help, contact the WIC Vendor Relations Unit:
