I was really pleased with the fit shaper panty. I was carrying fairly small all the way up to my 8th month. I am an average sized woman (size 8-10) pre pregnancy and i ordered the medium and large sizes. I am nine months pregnant right now and am still using the medium. If you are about my size, not carrying big, and looking for a nice -comfortable- snug fit, i believe the medium is good. The large size just left me feeling a little too "loose". The fit around the legs is nice too. I have had spanx in the past and they are just way too tight and uncomfortable. These, from motherhood, are much better than spanx. These are great under jeans, pants, or dresses. Ive been wearing them from 4 months on....they won't dissappoint. Oh, AND, as a plus, you cant beat the price!!