16 weeks refers to the protection of a woman’s employment.
No employer is permitted to fire a pregnant woman or a mother in the first 16 weeks after giving birth.
14 weeks refers to the paid maternity leave
PDF brochure to download here in English
The minimum is 14 weeks paid leave (that may be 80% depending employer)
If you worked at the company a while, usually not very long a year or so, most companies give you 16 weeks.
As an individual, you could take the 14 weeks minimum and request to have 2 weeks extra, this would be unpaid if the employer only gives 14 weeks. But they cannot turn it down or get rid of you, you sort of have to self certify I think to go back to work, and you dont have to until after 16 weeks but then those 2 extra weeks are on you.
Then I think if you are breast feeding, the employer must find a room (not a toilet) for you to pump, they must allocate a decent amount of time frequently over the day to pump.
Its not very generous in Switzerland. But your HR and the web links given will be able to help
The additional one month for breastfeeding is only for people working for the state - nurses, teachers,... - or if you work for a very generous company !