This may seem like a silly question, but we're headed to the World in four sleeps and I wanted to ask...

We have made our three FP+ reservations per day, but I suspect that on the day we are at DHS we may not use the third (DS is only four, so he's not ready for many of the "big" rides and wants to do a lot of the Frozen stuff). If we end up not using a FP+ reservation on a given day, is that a problem?

Thanks!