My dd is almost 17 months and has just started to bum shuffle. She's never crawled, doesn't cruise or pull herself up. She has only just learnt to roll over.
She's been seen by a paediatrician and had a blood test which came back clear and there seems to be no cause for concern.
So I am interested to hear from parents of other bum shuffler's. Did your dc's just get up and walk one day? Were they 'late walkers?'