We did 4 days away (4hour drive) when E was about 3 weeks old, and I took loads of clothes in case of any dramas with nappies!

Do you wrap your bub to go to sleep? We have those zip up ones and I took extras of those just in case too.

We left straight after a feed, and he didn't wake til w got there.

If he cluster feeds in the afternoons, can you leave early in the morning?

I wouldn't worry about the gym, just somethin to lay him on which looks like you have covered.