“If they are undocumented, how do they know?”
That is an interesting question. Do we have a data base of illegals?
Re: “If they are undocumented, how do they know?”
Because ALL pregnancies and ALL births in the USA are potentially covered under Medicaid - to protect the child.
The hospital might ask for a Social Security number, but the illegals know they do not need one, so they don’t even try to fake it.
They just say, “I don’t have enough money to pay for this,” and that pretty much closes the deal.