Awful idea. Jesus. Is this a wind up? You should wait several months before taking a baby to anything even close to a freaking football match.
Not only could the noise wreck its hearing, you've also got the immense risk of it catching something in such a public place with screaming, coughing, sneezing fans in every direction, and with such a weak, undeveloped immune system, you could easily be heading back to the hospital and seeing your little one in intensive care.
Then there's the likelihood of it screaming nonstop, getting stressed to high heaven, and needing feeding and nappy changes multiple times during the match too.
Fuck me...