A new study adds to evidence that severe obesity is becoming more common in young U.S. children.

There was some hope that children in a government food program might be bucking a trend in obesity rates — earlier research found rates were dropping a little about a decade ago for those kids. But an update released Monday in the journal Pediatrics shows the rate bounced back up a bit by 2020.

The increase echoes other national data, which suggests around 2.5% of all preschool-aged children were severely obese during the same period.