You can also confirm what you're looking for by looking at 1841 and 1851 censuses
1851 Pampisford
Thomas Rolleston head marr 43 ag lab b Sawston Cambs
Mary Rolleston wife 36 b Ickleton Cambs
Isaac Rolleston son 9 b Pampisford
Emma Rolleston dau 6 b Pampisford
Anna Rolleston dau 3 b Pampisford
Ellen Rolleston dau 1 b Pampisford

Pampisford baptisms have been extracted onto the IGI at www.familysearch.org. Anna, daughter of Thomas and Mary Rowlinson was baptised on 8 Aug 1847; Ellen on 27 May 1849; Emma Victoria Rolinson on 26 May 1844. I can't see a baptism for Isaac though.

David