Am I the as*hole for telling a guy to move his crying baby out of a quiet enclosure at the zoo?

I (19M) visited the zoo today with my family and we were checking out the koalas, who I was especially excited to see. You may not know this, but koalas apparently need over eighteen hours of sleep a day to function or else they can get quite unhealthy quite quickly, and so any exhibit of them at a zoo will often come with an expectation that you maintain a certain level of silence while observing them. This zoo today was no exception – you are made to go through two gates, both of which have signage saying ‘Please be quiet, keep the noise down, silence please, etc’ and then the door to the koala house itself has another sign: ‘Please keep noise levels to a minimum’.

With all those reminders, I figured people would get the memo, but as soon as we entered the enclosure (which was a small room indoors with a glass window looking into the koala pen) I spotted a couple in their early thirties with two young kids and a baby. I somewhat apprehensively tried to observe the koalas (they were so cute and my little sister was happy to see them) but then, like clockwork, the baby starts crying. Hardly the baby’s fault – it’s a baby, they cry – so I gave the dad of the family the benefit of the doubt thinking he’d either take the baby out or calm her down. A few moments pass; the baby gets more annoyed and cries louder. The koalas scurry away, hiding in their cubby holes, and others wake up from their sleeping. I give the dad the look. I feel like everyone knows the look – we’ve either had someone give it to us or given it to someone else. I’m not sure I’d ever been on this end of it, but I’d definitely received some looks at times. Baby continues to cry. I (being a socially awkward autistic teenager) grapple with the idea that the dad might have missed my giving him the look so I do the classic: I shake my head and give a little sigh. No change. I throw another look his way – this time a little more firm – but I feel like I overdo it – my eyes are a little too intense, perhaps – because suddenly the dad is saying, in the voice of someone who’s just gotten a lecture ‘Well alright mate, it’s just a baby’ to which I reply with a gesture towards the sign ‘Silence, please’. ‘But it’s a baby!’ he says. ‘Well don’t bring a baby in here’ I reply, in a whisper. My parents jump on me, thinking I’m out of line and the couple and their kids give me the filthiest of looks and leave the enclosure, leaving me feeling very tense.

What do we think? I feel like this is a very common struggle in a public place where there aren’t always members of staff to enforce the rules. We want to pick our battles, of course, but this family bringing their baby in spoiled my little sister’s magical moment seeing a koala for the first time. Surely they should’ve seen the signs and thought ‘Probably best to not bring little Charlie in’ or, if they really wanted to see the koalas, the dad could’ve stayed outside with the baby and the mum and the kids could’ve gone in.

Am I the As*hole?