FreeREG has the childrens Baptisms Tamworth;
James 1823/John 1824/Joseph 1825/John 1826/Anne 1828/Hannah 1829/Edward 1831/Emma 1833/Arthur 1835/Robert 1837/Caroline 1839/Mary Anne 1840/Robert 1841
Burials;
John 1824 age 1/Anne 1828 age 1/Hannah 1829 age 1/John 1831 age 4 ( son of Robert/Mary)
/Arthur 1837 age 1/Caroline 1839 under 1 year
I cant find Robert/Mary or any surviving children in 1841 Census.
As you probably know GRO has later childrens Mothers mn as Smith.
Robert/Mary married 11 Aug 1822 Polesworth, Warwickshire