Yes we have the extended wings. Ds is 7 weeks and 14pounds 4 ounces and they still fit. He will outgrow the rise before the waist and he has a belly but the wings are saving us! They would not fit without the extended wings.
We have the extended wings and I'm very glad we got them. DD is 12 weeks and almost 12 lbs, and they fit great. She is a long baby and is just starting to outgrow the rise IF I add a doubler. I think the dipes will fit her for a few more lbs of weight gain, but if she gets much longer we'll have too much crack :LOL