I'm late to this thread, but I may have found some more children:
1788 12 21 Shelford - Mary, d of James and Elizabeth Foulds
1792 03 15 Lambley - Sarah, d of James and Betty FOULDS
1794 02 09 Lambley - Thos., son of James and Betty Foulds
1796 10 23 Lambley - James, son of James and Betty FOULDS
then the Oxton baptisms start in 1798,with Henry's baptism, details of the rest all as already provided upthread.
Humphrey died as a baby: burial in Oxton, 1808 10 20 Humphrey FOULDS Inf Oxton