Those are so adorable and they look like they'll stay on a babies' feet too.
In the photo of the completed bootie, at the toe area, it look like there is a decrease row (row 12?) after the last row of ribbing. It looks like the k1p1 are knit together across maybe 16sts to give you the 8sts on the center needle shown in the first photo you posted. Maybe that's the missing decrease of 8sts.