dont seem to loose weight

It's been almost 7 months now after giving birth, I'm still breastfeeding, but my weight seems to stuck at 54 kilos. I'm not really going on any diet yet, only slight workout, since I got hungry all the time after breastfeeding.

my problem mostly is on my tummy, after giving birth I felt that my tummy become loose haha... maybe bec. it was stretched for quite some time... don't know what to do...