Bottom shufflers seem to be notoriously late walkers.
I had a relative that wasn't walking at 22 months - everyone was very concerned - until one day she just stood up and walked across the room.
I had a demon crawler who delayed walking by a few months - because it was too slow! She would stand up and play with toys but then whizz across the room crawling because it was faster
I think it's regional differences...
Then she developed eight more in just a few weeks and had the full set by the time she was just over two years old! They caused her almost no problems, either.
