In SE Asia the motorbike is everywhere! It’s a lot cheaper than a car so it’s used to haul the entire family around – this includes, animals, babies, toddlers, children, chickens, and parents.
It’s not uncommon to see 4 people on one. Typically two kids and two adults. And maybe a dog too.
I even saw a large pig strapped to one in Cambodia.
I don’t think I’ve seen a children’s car seat yet.