Feeling down after I had my daugther TUMMY FAT

Luzy

Mind you I'm 19 at the moment! I literally got pregnant last year on my 18th birthday! Had my daugther in Dec 29,2017! Turned 19 on March 16. Before I got pregnant I was 118 , and felt confident and nice about my body, I'll add a picture. (The first pic) Now after I had my baby she is now 4 months, I haven't been able to do much because I have no sitter & I work sometimes. And I now weight 140 and have tummy fat. (2nd picture) sometimes I feel down because others tell me I'm fat etc. what are some diets I can do or what should I eat less & what type of workouts can I do to flatten out my belly and that would tone out my body? It would really help. Before I got pregnant all I would do would be running and softball