Need suggestions to maintain weight

Hi,
At the time of delivery my weight was 68 and when my baby was 5 months my weight reduced to 52kgs(back to old weight before pregnanancy). Am breast feeding, now my baby completed 10 months, again now my weight is increasing,I dint check my weight yet, my family members are telling your weight is increasing day by day. dont know what is the problem. I am worried, please help.

 

Am having normal food as before.. No exercise no diet yoga.. Nothing.. Automatically my weight reduced.. Again it's increasing... Can breast feeding mothers can diet? Please suggest