Best rail pass to tour Switzerland?

Hi all, we are visiting Switzerland in the end of April. 7 days trip and would like to cover as much as possible. We are likely to be on the train atleast for 6 days. Could someone please suggest a good rail pass for this? 2 adults and 1 child (2yr old). I saw that we could get a rail pass for 6 days for... show more Hi all,
we are visiting Switzerland in the end of April. 7 days trip and would like to cover as much as possible. We are likely to be on the train atleast for 6 days. Could someone please suggest a good rail pass for this? 2 adults and 1 child (2yr old).
I saw that we could get a rail pass for 6 days for about 300gbp. Should I be looking for deals? or just book? How to get a better deal? (booking in advance or booking online)..

Any relevant info is highly appreciated.

Thanks!
Tulipz
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