The magnetic dummy provided with a reborn doll supplied by NPK has been noted as a possible choking hazard by the European Commission.
The model number is G1902-CFW-04PMP.
The reborn baby doll comes in a ziplock bag along with a birth certificate. It’s possible you may have bought one through Amazon. NPK are a Chinese company.
You should contact them for a refund if you bought this doll. The doll is considered not to be safe. Trading Standards recommends its return.