Sudden lost of weight without special diet

Hi moms! Is it normal to lose so much weight in just 2 weeks after birth?. I was 79kg right before birth and just checked to find i lose 9kg. I havent even had my postpartum massage. I mean of cors every woman wants to be at their pre-pregnancy weight but in 2 weeks? Effortless?..#1stimemom #advicepls