Basically the name on the birth certificate is different from the name of the mother at the Christening. The birth on 22 January 1849 was registered on 22 February 1849 and he was Christened on 25 February 1849. The child was my Great Grandfather. The presumed mother died in 1853 and my Great Great Grandfather married the woman on the birth certificate in 1856. The census record for 1851 shows neither 'mother' at the presumed London address and my great great grandfather appears to have been away visiting on census night.
I hope this helps clarify my query and you might suggest some answer. Regards