The new Children's Minister Roderic O'Gorman says children under 16 should be able to change their gender with the consent of their parents or guardians and GP.
The Children's, Disability, Equality and Integration Minister also hit out at "toxic" and "homophobic" online attacks against him in recent days.
Laws to make it easier for 16 and 17-year-olds to legally change their gender will be introduced by the new coalition under a commitment in the Programme for Government. The document also commits to examining the arrangements for children under 16 who may want to change gender.
Mr O'Gorman said a review group had carried out work on the Gender Recognition Act.
"They brought forward proposals for children under 16. Right now, if they want to initiate a gender change, they have to get kind of high-level medical consultants to actually sign off on that. Whereas the recommendation is to make that easier to allow a GP basically to sign off to say yes."
He said he supported implementing the review group findings, adding: "In an area like this, you should be led by expert advice."
Mr O'Gorman also responded to online attacks against him in recent days. He has been under fire on social media over a photograph of him posing with leading British LGBT activist Peter Tatchell at a Dublin Pride march two years ago.
The Dublin West TD said he would not have posed for a picture had he known about Mr Tatchell's previously expressed views on consent. Mr Tatchell wrote a letter to the 'Guardian' in 1997 saying that some friends made a "conscious choice" to have sex with an adult when they were under 13.
Mr Tatchell has since said his letter was edited and has clarified in recent days on Twitter that he condemns and opposes adults having sex with children.
Mr O'Gorman said the Pride march was the only time he met Mr Tatchell.
He said: "I feel there's been a kind of a pile-on from some of the fairly right-wing groups on social media.
"They're using a combination of misinformation and people's legitimate concerns about issues, particularly around children, and kind of tying that together in fairly toxic attacks against me."
He said: "There is no circumstances in which sex between an adult and a child is acceptable." He said online claims that he was unsuitable for the role because he is gay were "homophobic" and "an attempt to silence people from minority groups".