DriveNow for kids
You can find the cars in the app, where the child-friendly cars have a line with "Child booster seat". You can also recognize the cars from the sticker in the rear seat window.
The booster seat is suitable for children from 15 - 36 kg. If you want to bring your own child seat, all of the cars has Isofix mount, which makes it possible to secure your children when using the cars.