So what would you expect from your 3 year old when you're out.
DS2 is 3.5 yrs.
Would they be in the pram?
No. He stopped using a pushchair before he was 3.
Would they need reins?
I still sometimes use reins if I'm out with all 3 DC and will be near roads, but he is very good at holding hands, staying close and stopping when called, so they're not essential.
Can they tell you if they need a nappy change or if they're hungry?
Yes. He also tells me if he needs a wee / poo in time for us to get to a toilet.
Do they need nappies?
He still has pull ups at night. We started toilet training around his 3rd birthday, and he got the hang of it quickly. Toileting accidents are now rare.
How often do you need to stop on a 5 minute walk if they're not a pram? (And walking alongside you)
We usually only need to stop if we're crossing roads or DS2 trips over.
Do they travel on public transport very well?
We don't normally use public transport.
Could you tell them not to open the door on a taxi when it's in motion?
Probably.
Could you take them food shopping?
Yes and frequently do. DS2 loves food shopping and is usually reasonably well behaved in food shops, even when requests for stuff he wants are refused.