The weight after natural birth. Any suggestions?

hi, my length 163 , my weight 65 kg ( currently ) , my age 28 ,before the pregnancy i was 60 kg without diet and sport and i was eat freely without suffering from overweight , after the birth of my child i couldnt restore my previous weight and i eat the food less than before pregnancy and my weight is continue increase , i ask if there is a hormonal problem that cause of increase my weight although i eat not more than 1500 calories in a day.

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