Playschool wants the full year's fee upfront for a 2 year old. What if he doesn't settle?

Visited two playschools for June. Both want the year paid in advance, with a line saying fees are non-refundable once the session begins. He has never been left anywhere. He may love it. He may scream for six weeks and we take him out. I asked one centre what happens then and got 'children always settle'. That is not an answer. Has anyone got money back from a playschool after taking a child out early? Or negotiated monthly or term-wise payment before signing?