Flexible bub, not crawling properly

[Pandora]

Will post later I'm at a family do but sounds almost exactly like my 11 month old

[Snacks]

We have a friend with a bub who's got developmental delay. He has low muscle tone and the general pattern was for him to spread his legs apart. So on the advice of the physio and the OT he wears a strap/figure 8 bandage around his knees. This is designed to increase his muscle tone and make him strong enough to crawl and walk.
I would think that if your DD shows normal tone that perhaps it wouldn't be necessary, however I would be getting a second opinion and not dismissing it altogether. I think "barbaric" is a pretty strong word to use in this instance. When you think about it, most physiotherapy is pretty full-on. Every time I have seen a physio it has hurt, LOL. This treatment doesn't even hurt them, just encourages their bodies to grow in a different way (like braces for hip dysplasia). However I would always get a second opinion if I was uncomfortable with a certain treatment.