I have a 2-year-old in San Francisco. We walk or take transit everywhere. (I also don’t use a stroller, so the kid is either walking for himself or riding on my shoulders, or occasionally riding in a wagon to the grocery store 2 blocks away.) My wife bikes to work. We have a car but it is mostly only used for trips to Costco and road trips; we could certainly get by with occasional rentals/taxis, but the car is occasionally convenient.

At some point in the nearish future I will probably put some kind of kid seat on the back of my bike.