On receipt of a death certificate of a person who was under eighteen years of age at death, the local registrar of vital statistics shall determine the county in which the person resided at the time of death. If the county of residence was other than the county in which the person died, the registrar, after registering the certificate and no later than four weeks after receiving it, shall make a copy of the certificate and send it to the local registrar of vital statistics of the county in which the person resided at the time of death.