Do I need a ticket for a 7 month old or 2 year old for all Ireland
Quater final in Croke park Saturday 7th August

Hi Iorcan-ga,

Yes, according to the official ticket site,
https://secure.gaa.ie/tickets/info/faq_tickets.asp
"2. I am attending a game in Croke Park this Sunday with my young
child. Will I need a ticket for him / her?
All patrons no matter what age, require a ticket to enter the stadium,
but Family tickets are from your local club or County Board."

A search brought up several sites. This one offered online tickets
from the official Croke Park Web site and I suspected that they would
offer answers to common questions.

If you have additional questions, you'll probably find that they're
answered in this section as well.

Enjoy the game!

Search terms: Croke Park All Ireland Quarter Final Tickets

Regards,
bcguide-ga