My DS1 stopped going in a pram/stroller when he was about 3 years old. DS2 arrived the day after his third birthday and I had a toddler seat for our pram, but never ended up using it.

There is 22 months between DS2 and DD and I use our P&T pram with the second seat daily. DS2 is 2 1/2 and still happy to sit in the pram or stroller.

HTH