My 3rd great uncle [[Kearney-2409|Nicholas Kearney (1818-1897)]] was baptised in County Dublin, Ireland on 13 Jun 1818. This is the date given in the church register, and is correct.
FindAGrave gives a photograph of his grave stone in Massachusetts USA, where he emigrated to, and a date of birth of 24 Dec 1817. This is verified by nothing other than the inscription on the grave stone itself.
Roman Catholic children in Ireland were usually baptised within two or three days of birth, a week at most, unless unusually ill at birth.
My question is whether or not to take the date of birth from the grave stone for his Wikitree profile, or not to trust it. At present, I have simply estimated the date of birth, but given the baptism date. There will be no birth registration, only the church baptism register.