This is likely the bill, passed two days ago:
https://www.legis.iowa.gov/docs/publications/LGR/90/SF542.pd...
It is an amended form of a previous bill passed in April (linked by another comment). I noticed that it now clarifies that children under 14 are not permitted to work (previously it was allowed under certain conditions). So, that’s good. 14 and up are allowed to work.