Baby food labels will disclose levels of lead and other toxic heavy metals via QR codes, thanks to a California law taking effec 1.

The U.S. Food and Drug Association (FDA) released the first-ever guidelines for levels of lead in processed baby foods this week. However, many health and safety advocates say they are not satisfied with the guidance.

For the first time, the US Food and Drug Administration has set a limit on the amount of lead that can be in baby foods, but critics say it’s too little, too late.