Hi,
I can highly recommend Susanna's International Kinderkrippe:
http://www.kindergarden.ch/
They take babies from 3 months old and the costs are 110 CHF per day. If your joint income is less than 12,000CHF (I think this still applies) then you can get assistance with the cost from the government. The kinderkrippe can actually do all of the paperwork for you and tell you what copies of things the government require.
The staff mostly all talk English and they are fantastic with the kids. My daughter loves it there and I feel completely at ease leaving her. They do great activites with them and take them on daytrips to the zoo/animal farm/park/pools.
I chose this option over a nanny as a nanny can get sick and then you are stuck for help. With the kinderkrippe they are always open except for bank holiday's.