Hello there,
I looked for the information on the IGI - Latter Day Saints website -
www.familysearch.org/Eng/search/frameset_search.asp? On many baptisms (marriages etc too) there is a 'batch number' below, which if you click on it, will take you back to the first screen and you type in the surname again (and the father's first name if it's a common surname) and it will search that church register/ film/ records they hold (they are not complete records) for other baptisms on that batch number. You can use that screen and change the last number in the batch number from 1 to 2, 2 to 3 etc up to 9 and search other records at that church also as they often are listed on subsequent batch numbers. Hope this makes sense??
I did have a look for other children on this batch number and there were none. It is also not uncommon for ancestors to move around and it is not that far from Westminster to Whitechapel. My husband's family moved all over London then to Berkshire between 1841 and 1901! As for changing occupations, again, I have come across some extreme cases of this also: from jeweller to labourer etc! I think it was deliberate to throw us descendants off the scent!!
Good luck! Louise