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Did your consultant say there was a restriction in bathing? I've been having them ever since I left hospital without an issue (no stoma though). I imagine it's ok to bath whenever you want, just dont use bubble bath. If you're having doubts you called always call the IBD nurse or stoma nurse at your hospital and ask them for advice.
Check with your doctor on the stitches thing, but aside from that, baths are fine anytime! You can swim and sit in a bath with a bag on, though you might need to change the bag soon after if the adhesive comes loose. You can bathe without a bag as long as you are in an area with a trusted clean water source.