I can't reproduce the search results you mention, but I have found some others, but they don't seem likely matches. Can you send me the link you have?
Using this search
https://www.familysearch.org/search/records/index#count=20&query=%2Bgivenname%3Asarah~%20%2Bsurname%3Awhitehead~&collection_id=1827268
name: Sarah Elizabeth Whitehead
event: Christening
event date: 24 Oct 1875
event place: All Parishes, Jamaica
gender: Female
birth date:
father: Whitehead
mother: Catherine Caroline Foster
page: 114
line number: 19
film number: 1291708
digital folder number: 004620473
image number: 00296
Citing this Record
"Jamaica Church of England Parish Register Transcripts, 1664-1880," index and images, FamilySearch (
https://familysearch.org/pal:/MM9.1.1/VHDJ-D32 : accessed 01 Nov 2012), Sarah Elizabeth Whitehead, 1875.
The actual page of the regisater (using the link above) says she was illegitimate and black, and the baptism was in Westmoreland..
name: Sarah Whitehead
event: Christening
event date:
event place: Manchester, Jamaica
gender: Female
birth date:
father: Whitehead
mother: Whitehead
page: 225
line number:
film number: 1224313
digital folder number: 004620459
image number: 00518
Citing this Record
"Jamaica Church of England Parish Register Transcripts, 1664-1880," index and images, FamilySearch (
https://familysearch.org/pal:/MM9.1.1/VHDH-HLT : accessed 01 Nov 2012), Sarah Whitehead,
This one seems to be the baptism of slaves owned by one E. Peart Esq. I recognioze the names of some of the plantations as being in the Parish of Manchester. If you look at the earlier page 219 (image 111) you will see that the list is for the year 1822. The ages of the slaves are not given.
https://familysearch.org/pal:/MM9.3.1/TH-1-13843-10519-74?cc=1827268&wc=12962142
Let me know if I can help further.