https://www.politico.com/news/2022/05/19/baby-formula-shortage-federal-contracts-00033581

Looks like it's about 50%.

"About half of all babies born in the U.S. qualify for WIC, which serves low-income families. "


I would say we are in trouble yes - but my take might be different than yours. I think we're in trouble because half the babies born are born into what constitutes low-income households. To me that's trouble.