Hi,
I found this one,
Edmund WALLIS
Christening Date: 27 Dec 1812
Erith, Kent
Father's Name: William Wallis
No mother's name mentioned.
There are other children with parents William WALLIS and Ann/e born in Erith around this time, both before and after Edmund, so I wonder if her name has just been left out? They are,
Elenor WALLIS 14 Dec 1806
Thomas WALLIS 18 Sep 1808
Harriot WALLIS 25 Nov 1810
Sarah WALLIS 19 Feb 1815
Ann WALLIS 10 Aug 1817
James WALLIS 24 Oct 1819
Charles WALLIS 9 Jun 1822
In case it's connected another couple Thomas WALLIS and Elizabeth, start having children in Erith in 1812, these are,
Hannah WALLIS 25 Oct 1812
Cordelia WALLIS 24 Dec 1815
George WALLIS 8 Nov 1818
Matilda WALLIS 14 Oct 1821
Stephen WALLIS 22 Aug 1824
Hope this helps

Regards
Daisy