Fraternal Twins Still not Crawling

The fraternal twins are now rocking on their hands and knees. The twin girl has been doing it for about a week, and the twin boy just started. I believe the twin sister wanted to get at a particular toy more than the twin boy. I don’t know how long until they’ll start crawling, but I imagine the twin girl will do it before the twin boy.

The fraternal twins when they are not rocking push themselves up with their arms, which causes the twin baby set to move backward. You can imagine the frustration this causes, moving backward when the toy is very clearly in front of one of the fraternal twins.