Brian Lawson's Births Index has these Salthouse entries:

Alice May SALTHOUSE [born] 1 May 1899 Ram [father] William SALTHOUSE [mother] Isabella STARKEY
John SALTHOUSE 17 Jan 1901 Ram Joseph SALTHOUSE Annie MAXWELL
Joseph SALTHOUSE 8 Jan 1900 Ram Joseph SALTHOUSE Annie MAXWELL
Lena Isabel SALTHOUSE 23 Nov 1897 Ram William SALTHOUSE Isabell STARKEY

So the Joseph who died aged 2 weeks was Joseph and Annie's baby, which fits the address given at the burial and in the census.

Sue