dd1 didn't crawl at all, walked at about 18 months.
dd2 doesn't do anything at all, sits on the floor, can move round in a circle on the spot.
My friend's baby is 5 days different in age than dd2 and is running all over the place. Doesn't usually bother me but yesterday when I saw them together, I wondered if there is something I haven't done with them both being late walkers.
Do you think sleeping bags delay walking?