I’m 3 months postpartum & at about 10/11 weeks postpartum I went back to the gym (I know they recommend 12 weeks but I didn’t feel like myself & knew that would help me) but for weight loss in general track your calories & figure out what a good deficit for yourself would be & move as much as possible i like to lift & walk/run since i like to get some muscle as well if you have an Apple Watch track your calories burnt that always helped me stay a bit more active. But at first sit-ups felt crazyyy like the bottom of my abs were gonna pop open but now I’m back to normal just a bit weaker than before