Hi,
Thank you very much for your message.
Civil registration only became mandatory in Ireland in 1864 so for any births before this year you will have to look at the local parish records for baptismal certs.
Most Catholic records are held locally so you may need to write to the local parish priest for possible assistance. One website that you may find useful is the Irish Times where they give an overview of what records are available in specific parishes. It also shows you where copies of the records are available. For parish, follow this link:
http://www.irishtimes.com/ancestor/fuses/rcparishmaps/index.cfm?fuseaction=showidrecords&CityCounty=Cavan&parish=Annagh&churchid=815
As you can see from the above link Cavan Heritage and Genealogy Centre have copies available. Here is their email if you would like to contact them, however a fee may apply: cavangenelogy@eircom.net
For the births after 1864 there should be a civil record of it. Civil records are available from the General Register?s Office. Here is their website:
http://www.groireland.ie/research.htm
You can search the indexes to these records up to 1958 online at:
https://familysearch.org/search/collection/1408347
Have you tried looking for any of the family that remained in the 1901/1911 census records? These are vailable online at: http://www.census.nationalarchives.ie/search/
Some other websites that you may find useful are:
The National Archives of Ireland http://www.nationalarchives.ie/genealogy1/genealogy-records/introduction/
The National Library of Ireland http://www.nli.ie/en/family-history-introduction.aspx
The National Archives UK ? genealogy search: http://www.nationalarchives.gov.uk/records/looking-for-person/
The Public Records Office of Northern Ireland http://www.proni.gov.uk/index/family_history.htm
Family Search: www.familysearch.org
Genealogy links: http://www.genealogylinks.net/uk/ireland/cavan/index.html
The US National Archives: http://www.archives.gov/
Please be patient - as our programme has only begun to rollout across the island of Ireland and volunteers in some areas may not yet be organized.
Kind regards,
Genealogy Support