These pants are seriously the best sleep pants I have EVER bought. I'm 5'9" and it's impossible to find pants long enough for me - and I like my pants LONG, like they need to be touching the ground. These are super long, very soft and I LOVE the waistband. I'm currently 9 months pregnant and I can fit the waist band comfortably around my belly or underneath it. I have no doubt they will fit postpartum too. I went through the reviews before purchasing and it looks like there are some different fabrics depending on the type, I just purchased the plain "Charcoal" (no letters/numbers after). I'm buying another pair today for my hospital bag!