The 1914 marriage is on
Emerald ancestors, but Kelso births stop earlier
Familysearch.com has two marriages
John Kelso
Ireland, Civil Registration Indexes, 1845-1958
marriage: October 1914 / December 1914 Belfast, Ireland
John Long Kelso
Ireland, Civil Registration Indexes, 1845-1958
marriage: January 1914 / March 1914 Belfast, Ireland
and some sad early baby or childhood deaths for the name John Kelso
John Kelso
Ireland, Civil Registration Indexes, 1845-1958
birth: 1916
death: July 1916 / September 1916 Belfast, Ireland
John Kelso
Ireland, Civil Registration Indexes, 1845-1958
birth: 1916
death: April 1919 / June 1919 Belfast, Ireland
John Kelso
Ireland, Civil Registration Indexes, 1845-1958
birth: 1917
death: October 1919 / December 1919 Belfast, Ireland
I am entering a timescale 1914- in which I dont have experience in looking for births.
The way forward is either General Register Office (NI) ie GRONI which has Registration indexes Eg births registered from 1 January 1864 in what is now Northern Ireland. It also maintains a public search room where you can search computerised indexes. The index provides name, date and place of event. BUT it has restrictions OR if you can find out if they had a church wedding, that church might also record births
So over to other sand yourself. Good luck JimG