Because they've been scooting for a couple weeks now you're probably going to have to do some extra work with them to get them back to standing and walking. If it was me, I would go for the Vitamin B complex - just because it works so amazingly for leg issues. I would tape their legs into position, and then work on helping them stand for a few minutes every half hour or so - supporting most of their weight with your hand, but letting their muscles work some too. Plus continue swimming a couple times a day for exercise.