There are two birth records for Samuel Jennison. Jennison seems to be the correct spelling. There is a difference of months of birth, Mar. or May, given for the records.
Sources
"Massachusetts Births and Christenings, 1639-1915," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F4DW-S77 : 4 December 2014), Abigail Jennison, 18 Dec 1702; citing Sudbury, Middlesex, Massachusetts, p 80; FHL microfilm 185,455.
"Massachusetts Births and Christenings, 1639-1915," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F4DJ-47P : 4 December 2014), Samual Genison, 10 May 1701; citing Sudbury, Middlesex, Massachusetts, yrs 1663-1829 p 3; FHL microfilm 185,454.
"Massachusetts Deaths and Burials, 1795-1910," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FH1H-YJ4 : 10 December 2014), Samuel Jenison, 14 Oct 1729; citing Middlesex Co., Massachusetts, reference p 299; FHL microfilm
WikiTree profile Jennison-40 created through the import of Travis Family Tree.ged on Jun 22, 2011 by Roger Travis. See the Changes page for the details of edits by Roger and others.
Source: S-1938396353 Repository: #R-1938398764 Title: Ancestry Family Trees Publication: Online publication - Provo, UT, USA: Ancestry.com. Original data: Family Tree files submitted by Ancestry members. Note: This information comes from 1 or more individual Ancestry Family Tree files. This source citation points you to a current version of those files. Note: The owners of these tree files may have removed or changed information since this source citation was created. Page: Ancestry Family Trees Note: Data: Text: http://trees.ancestry.com/pt/AMTCitationRedir.aspx?tid=26867133&pid=1289
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