Nothing is compulsory. You should wear a belt or an Abdominal binder only if you feel comfortable wearing these. Half of the Indians are rice eaters. They also have Caesareans. I am sure they don't change their food habits after the operation. In short, lead your normal life as you were doing before the Caesarean. The only thing is don't over-exert yourself.

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Not compulsory to use binder. If u want u can use dupatta too, even if u don’t use anything, it is okay. U can eat rice and anything that is homemade (non infectious, nutritious)