Fans who are hoping to attend the All-Ireland football and hurling finals will need to buy separate tickets for babies or young infants that are travelling with them.
Tickets will be at a premium for the upcoming decider between Dublin and Tyrone in the All-Ireland SFC decider, as well as the clash between Galway and Limerick in the corresponding hurling fixture.
All fans will need an individual ticket for those fixtures at Croke Park as outlined under the terms and conditions on the official GAA website.
"For 'all-ticket' events every person [including infants] entering the venue must have a ticket. Please note all events in Croke Park are 'all-ticket'," it says.
Tyrone supporter Caoimhe Hill McCann brought her 16-week-old son Connla to the All-Ireland SFC semi-final against Monaghan on Sunday, which was his seventh game to attend this season.
McCann told RTÉ Sport that she didn't require a ticket for her son when attending previous fixtures at venues this year including Omagh, Carlow, Navan and Ballybofey. She also said she was not aware that a baby would need a ticket for all-ticket games.
But when she approached the turnstiles at Croke Park, she was stopped along with her husband Johnny and informed that their baby - who his mother was carrying in a sling - would require a ticket.
"There was a young girl taking tickets and she asked if we had a third ticket. We thought she was joking thinking that he didn't need a ticket for him yet. She told us we couldn't get access without a ticket for him," she said.
"She went and got her supervisor and he came to the turnstiles to speak to us and said there was no entry without a ticket. We told him he didn't need a seat and that he would be attached to me but they said that was irrelevant and told us we needed to go down and buy him a ticket."
The McCanns were assisted by stewards to obtain a ticket for the last-four tie but the delay in gaining entry resulted in them missing the first 10 minutes of the game.
They will also need a ticket for the baby when Tyrone take on Dublin in the All-Ireland final.
"You don't want to be buying a ticket for the baby if it means that somebody else is going to lose out. I just think the way it works needs to be reviewed," she added.
Speaking to RTÉ Sport, the GAA's Director of Communications Alan Milton explained that all spectators require a ticket for ticket-based fixtures due to health and safety reasons.
"It's a long-held practise and most people would be aware of it because we put it in the public domain every now and then."
"Every person coming to the stadium requires a ticket. It's for health and safety and it's just best practise. It has to be black and white for health and safety reasons."
By contrast, the IRFU Director of Communications Stephen McNamara told RTÉ Sport that babies under two years of age do not require a ticket for Ireland internationals at the Aviva grounds as outlined on the stadium's website.
