Loosing weight but huge problem with tummy

I am very happy bec. I'm loosing weight... after almost 10 months of giving birth from 140 I'm now 113lbs, I feel so happy bec. slowly my old clothes are fitting again! and I can already keep some of my preggy / big clothes and pants... but I guess my biggest problem is still my tummy. even though I loose all those weight, when I tried some of my pants everything seems to fit EXCEPT the huge tummy, in the end I can't zipped up my pants, or even if I zip it up my huge tummy is popping out.

When I go shopping for clothes I tend to look for baby doll style clothes fits on top but loose on the tummy area. I still am afraid to do situps, bec. everytime I tried I'll feel something weird in my cs section cut so I stopped! I hope there's another way I can loost this tummy, is it's also bec. I'm still breastfeeding and did not have a regular period yet. up until now I still have my period 1 time and only for a few days. 1 period for almost 10 months! ha! plus I had a CS so all those blood did not come out? hmm... I really need help and hope there's a way I can loose this tummy!