In case you need a birth certificate for official purposes you will need to order it from the Irish Health Service Executive http://www.hse.ie/eng/services/list/1/bdm/Certificates/
There is a baptism listed for a Michael Hogan on Rootsireland.ie, Michael was baptised on the 21st February 1905 in Dungarvan county Waterford, parents Declan Hogan and Bridget Walsh from the address Kilongford, Dungarvan Waterford
*PRESENT AT BIRTH
ADDITIONAL INFORMATION ON THE BAPTISM RECORD:
Place of birth: Killongford.
Informant: Stack Kate*.
Informant address: Dungarvan.
Registration Date: 20 MAR 1905.
Registrar: Williams John W..
Register: DUNGARVAN BTH BK 21.