Hi CC.
I think you might have two little Susan May's there.
One born 1873 and the other in 1878.
The one with the birth date of Sept 1873 seems to have died Q2 1878 aged 6.
(Dublin South - Vol 2 Pg 899 ) ?
So the Q4 1878 Susan is possibly the next child born to Martha and Richard, rather than a really, really late registration.
Seems weird now, but they would often 'reuse' a name, when a child had died.
Not an expert on this but there was a charge for registration in the first place and a late registration would incur a fine. I have it in my notes somewhere, I'll have a look or perhaps someone has it off the top of their head ?
Do let us know if you get any new info from the certs you have ordered

Pity no sign of Margaret's birth yet
