The entry on freebmd gives the birth of William Pointon at Wolstanton registration district as June 1841, so by April 1851 he would still be 9 years old? Just.
I have been doing a lot of research into old records from Tunstall, and the name Pointon/Poynton appears in them a long way back.
I think there are some old posts about Poyntons from Tunstall here on Rootschat. I'll see if I can find them.