Easy, when you check out of all stars, ask Bell Services to transfer your bags to your next resort. You may not get your bags until 5 or 6 in the evening so any meds, swim suits, extra diaper/kids clothes etc. you might need , keep with you.
We done transfers many many times, only had one true mix up and a couple times delayed until maybe 6-7 pm. The one mix up, we were moving to beach club and bags were sent to Caribbean beach.