I have to second this as someone who used to commute in a crowded Metro in the before times. Thankfully I get to stay WFH 4 days a week.

Commuting sucks for most people. For OP, they were taking their baby on a fun day out and the bus was part of that, but for most people, that bus/train/metro ride is strictly a point A to point B thing.

I admit I'd cringe when I saw someone about to push on a big bougie pram during peak hour, especially when the smallest baby was inside it. They take up a lot of space, it was already crowded, and like you say, it makes everything slower when people need to get off. Sometimes I was thinking "great, there goes my chance to grab a take away coffee before I clock in, you seriously couldn't have waited another hour with that massive thing", especially when the pram would have to get off and back on at every stop to let people in/out. I will admit it annoyed me as a childless person. But as a parent, I think it was OK to be annoyed. I think sometimes as parents, we forget that while our children have right to exist and go places, people are allowed to look annoyed if a baby is screaming its head off, and they're allowed to have a frustrated eye-roll at the 5th metro stop where it's taken triple the time because the pram has to get off and then back on. I do definitely agree that much of the problem is the design of public transport. It really is designed for able bodied people.

I will admit that before I had my daughter, I'd often feel more frustrated with the parents than the disabled or elderly because I felt like the parents had a bit more control? Like you don't choose to be disabled, getting old is inevitable, but having a child is a choice kinda thing. I'd think "don't be so selfish during peak hour, carry your child if you really must travel with them right now". But that was something I had to eat humble pie on because I didn't realise how much carrying a kid fucks up your back and how hard it is to carry a kid for an extended period of time. But I think we parents, we have all eaten humble pie on something. My kid also watches an iPad when I need her to be quiet, and my kid was never going to have an iPad.

But I think ultimately, while kids have the right to be on public transport because it is for the public and kids are part of the public, people are allowed to silently annoyed. I'm not saying they should have the right to abuse of course, but people are allowed to roll their eyes if your kid won't shut up and they have a headache.