If this was a case of adoption, there wouldn't be an issue; once the adoption was registered here, the child would be entitled to Irish citizenship because one of their legal parents is Irish.
It shouldn't be any different in this case, regardless of how the baby was conceived.
Two women who married one another in Ireland will challenge a decision by the State to refuse an Irish passport for their daughter who was conceived through IVF in the UK.
jrnl.ie/6979820