My mom had to spend some time in one of those mobility scooters after surgery here in the Netherlands.

Praised the bike infrastructure even more than she did on a bicycle.

You can ride your mobility scooter on the bike lane, where you're not held back by people walking slowly on the sidewalk, nor in danger of being hit by a car on the road. Bike paths are wide enough for cyclists to go around the mobility scooter and the vast majority won't mind doing so.

As for babies, we often put them in special seats on our bicycles, or use a so called "bakfiets" which has a nice big cargo area for the kid to sit in. These are also great for cargo in general, I've transported 19" servers in one before. For longer distances you can use the train, or of course a car.