Yes. In California, infants can start working when they’re 15 days old, provided that they (or their parents) have a work permit and a note from a licensed physician. According to the California labor code, the note must attest that the child was not born prematurely, was of normal birth weight, and is, in the doctor’s opinion, “physically capable of handling the stress of filmmaking.” Also, the child’s lungs, eyes, heart, and immune system must be “sufficiently developed to withstand the potential risks.”
In some states, like New Mexico, West Virginia, and Wyoming, there are no age restrictions on acting gigs. That means babies can make their screen debuts as soon as their umbilical cords are cut.