How can I avoid an infection after a C-section?

Dear Doctor, I had my first baby through C-section a week ago, and was advised to not take a full bath lest I get an infection for at least two weeks. So, I wrap a towel around my scar area and take a sponge bath. However, my sister who has had three Cesarean sections, tells me I do not need to go the whole two weeks as advised and that she was fine taking a normal bath a week after. I’m a little worried though. How long should it take before I take a normal bath and what can I look out for in case of an infection?
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Dr. Rachna Pande