
Our son has no rump. It's quite funny because his pants are always falling off.
He likes to "cruise" around the room by using the furniture to balance him out, but he has a tendancy to step on his pants (which are falling off his rump) and trip and fall. It's so cute. We have to really pull his pants up high to get them to stay on a little longer.

Asher is wearing 3-6 month clothes, but his jammies are getting shorter, and I don't think its because his legs are getting super long, its his torso. The pants that he's wearing in these pictures are 0-3 month size. He just doesn't have much to his rump.
I think it can only be considered cute at this age.