Children born England:
Violetta Louise Mar qtr 1895 Bath (5c/585) - died Mar qtr 1895 Bath (5c/498)
Violet Alice Elizabeth Dec qtr 1896 Bath (5c/541)
Rosalind Augustine Mar qtr 1898 Bath (5c/536)
Lilian Maud Dec qtr 1899 Pancras (1b/48)
Walter Wallace Benjamin Sep qtr 1902 West Ham (4a/133)
Constance Florence May Mar qtr 1905 Woolwich (1d/1298) - died Dec qtr 1906 Kings Norton (6c/270)
There is a birth notice presumably for Violet:
"POW - Sept. 6. at 2. Edmund's-place, James-street, Bath, the wife of Walter Wallace Pow, a daughter."
Bath Chronicle and Weekly Gazette, Thursday, Sept. 10, 1896
Modified to add:
I assume you have seen Walter Wallace POW's Australian Army service records?
free to search:
https://recordsearch.naa.gov.au