Alternatively it may be one of those cases where a young couple found that a baby was on the way and didn't make it down the aisle.
James Rixon was actually younger than we thought - birth reg Dec qtr 1867 Mile End Old Town, so only about 19 when daughter Elizabeth was born.
Added: James' birthdate was 25 September 1867, according to his baptism on 7 November 1879 at St Luke's, Mile End Old Town. Parents: Elijah (a baker) and Martha Louisa.