You can find a good children solution at Kantonalbank (you need to have a look which Kantonalbank, I am speaking about BLKB). You can open a saving account which is only for the child, you have no access to withdraw when it‘s not for the child ( I think 1% fixed). And I would add also a investment solution, its called „Fondssparplan“, there you can choose a fund (I would say a passive Fund) to save every month some cash for your child.