This is the first item that ever made me almost look forward to going to hospital for delivery! Im so so scared, esp since my baby is measuring greater than 99th percentile docs said, and Im only 5 ft small... having to pack for a potential c section. Trying to get stuff to make this any less scary! I was 120 lbs pre pregnancy, 162 lbs now at wk 39, small/medium fits fine, even though my bump is huge. The flaps that completely open at the top is good, I can get in or out of it in many ways, looks like it will do fine for vaginal delivery or c section.
Update: when I bend over, the button on the butt does pop open... not sure if a bigger size wouldve helped.