Looking at a couple online trees, they have Abigail as the daughter of Captain William Rice & Phebe Rice born in Warwick, RI. This seems to match up with the date as sites state her birth on Feb 20, 1729/1730/1731. See https://familysearch.org/search/tree/results#count=75&query=%2B... 3)
https://familysearch.org/pal:/MM9.1.1/F834-DLP
I selected 1731 among the dates just because it was after the marriage of William and Phebe, but it could have been the prior year.
