The baby formula shortage has reached new heights.

Nearly 40% of popular baby formula brands were unavailable and out of stock at U.S. retailers during the last week of April, according to data from Datasembly.

For reference, the out-of-stock rate of baby formula brands in early April was 31%, according to Datasembly, and for the first seven months of 2021, it hovered between 2% and 8%.

But baby formula shortages began to increase in November 2021, and the trend has been worsening throughout 2022.

“Unfortunately, we don’t see this slowing down any time soon,” Datasembly CEO Ben Reich said in a statement Monday. “Inflation, supply chain shortages and product recalls have continued to bring volatility to the category, and continues to be one of the most affected products in the market.”

What caused the baby formula shortages? Where are they occurring?

The shortages were prompted by a shutdown of pharmaceutical company Abbott laboratories’production facility in Michigan after it recalled certain types of baby formulas made at the plant because four consumers said it gave their infants bacterial infections.

Shortages are more pronounced in some states than others, including New Jersey, Connecticut, Texas, Montana, Delaware, Rhode Island and Washington, according to Datasembly.

Are stores rationing baby formula as a result of the shortages?

Major retailers such as CVS, Target and Walgreens are limiting the amount of baby formula that customers can purchase.

Walgreens and CVS are each limiting consumers to buying up to three baby formula products per transaction while Target is limiting consumers to buying up to four baby formula products per transaction.