« Reply #4 on: Monday 20 September 10 18:30 BST (UK) »
Edward is on the 1851 census aged 10 with parents Thomas & Sarah, but there's no sign of the family in 1841. Births in Bedwellty at that time would show as registered in Abergavenny. There is no registration showing up for an Edward Bevan in that district.
Where did you get the date of March 1841 from? If he was born then, he should be on the 1841 census as it was in June.
There is the possibilty that he was born before his parents' marriage & is registered under his mother's maiden name. Or he just wasn't registered at all.

Cornwall: Allen, Bevan, Bosisto, Carnpezzack, Donithorn, Huddy, James, Retallack, Russell, Vincent, Yeoman
Cards: Thomas (Llanbadarn Fawr)
Glam: Bowler, Cram, Galloway, James, Thomas, Watkins
Lincs: Coupland, Cram
Mon: Cram, Gwyn, John, Philpot, Smart, Watkins
Pembs: Edwards (St. Dogmael's)
Yorks: Airey, Bowler, Elliott, Hare, Hewitt, Kellett, Kemp, Stephenson, Tebb