I ran across your post, hoping that someone would have responded so that I can use the info too. I'm looking for a lead as well, my great great grandmother never listed her parents on marriage certificates, and Im unsure how to obtain a birth record.
Anywho, Have you tried obtaining the immunization or medical record from the hospital? Sometimes, the hospital may keep those sort of records. OR maybe a death certificate will help? Also, keep searching for brothers and sisters, in-laws, and use the spouses name as a way to gain information! Good luck. Hopefully you find what you are looking for.