Suggest Diet Plan For Weight Loss Post Pregnancy

Hello doctor. I m 27years old. My baby is 1.5years old. I was 64kg before I conceived. My height is 5ft 3inch. After my baby born I was almost 90kg. After some months I become 72.but now I cudnt maintain any diet plan as my baby is breastfeeding. I loose weight from 90to 72bt I want to get back my previous state. What will be my diet plan which will not hamper my lactating baby.