1841 King St. St Giles in The Fields, Middlesex
John 30, Selina 25 Jno 3 Wm 3 months all born in the county
Selina Frances Roberts 14 May 1815 St Andrew Holborn City of London
father William, Shoemaker
No clear baptism for John, too many possible, before 1813 generally only the parents were named, some parishes might enter some detail such as abode or fathers occupation, my guess he was born in the Holborn area.
Colin