Assume you are referring to baptisms at Westbury on Severn from 29 September 1745 'til 4 November 1759 - children of William BELLAMY and Elizabeth.

Bitton website
http://www.bittonfamilies.com/

Looking at the Gloucestershire Marriage Index - 1754 - 1799 - (which doesn't cover the FOD are) - there is only one BELLAMY marriage - Thomas of Barnwood, at Upton St Leonard - to Ether TAYLOR 7 November 1768.

My husband's x grandfather was christened in Bitton in 1835, and looking at the copy page of his baptism - the family came from 8 miles away, and other people's occupations were Gypsie, Smith,Farmer, Mason, Carpenter, Hatters - This was area for hat making.