Hello Hauwhoocke92
Firstly, welcome to the SBB Community!
There is a family coach (watch for the FA sign on the departure board) which offers more space, to be shared with prams and strollers. However, as soon as you occupy / block a bicycle space, you are required to have a bike ticket (or a day pass for CHF 15).
Your case must neither block entry doors, nor emergency exits, nor emergency equipment.
Kind regards,
Roland
