Careful Davhel52, I got lambasted for calling buggies Chelsea Tractors!
I'm the first person to give up my seat on public transport for anyone who needs it more than me, that also includes a parent with a buggy carrying a baby on their person.
I don't think we're all selfish, but there doesn't seem to be an unwritten rule any more about who gets to use the areas and seats on the bus.
As I said before, some methods of public transport are great for buggies, London Overground's longitude trains allow for plenty of room for everyone and those stations with lifts, including Forest Hill make it easier to transport kids. Something which was a real nightmare under Southern.