Hi Pat, The 1900 Federal Cenus asks the question regarding Year of Immigration, Number of Years in the United States and if the person was Naturalized. If you feel the births took place in the Town of Plymouth, Plymouth County, MA try asking the Library volunteers to check the Town Reports for those years. Some of the years listed the births and parents in the annual report. I do not know what year they stopped due to privacy issues. I did a search using [Plymouth Library Plymouth MA] in the search field but when I wrote down the URL and entered it, it did not connect. However, if you do a search the link from the listing for Lookups should work. Perhaps a better computer user will answer with a link in their response that will connect you. The Massachusetts Vital Records index lists surname, given name (if child was named at registration time), sex, date span and County. But I do not remember if that is the exact order. Massachusetts Archives might have these dates on microfilm now. The Archives are in Boston (Suffolk County) and I would post an inquiry to the Massachusetts general board asking for someone who uses the microfilm regularly if they could take a look for you. If you are not sure the county is Plymouth and the surname is not a common one it should be easy to check. If one of the common New England names it would be more time consuming without the knowing the county. These microfilm are also at the New England Historic Genealogical Society and perhaps someone would see the request who researches there on a regular basis. Barbara in Portland, OR