Civil registration for births did not begin until 1864 and all of the kids were born by then (according to later census in Scotland), so I'd need to be looking at the parish records for the children. I know of Alice (born 1854), Henry (born 1855), John (born 1856), Margaret (born 1858), James (born 1860), Annabelle (born 1863) and Walter (born 1864).