My son is 8 months now and can:
• army crawl (lifts bum up a lot when doing it though giving it more height than a typical army crawl) but uses both arms at the same time, hands folded together in his midline
• sits amazingly (always has been a sitter)
• gets in/out of sitting
• pulls to stand
• can cruise 2 steps (loses coordination after 2)
• climb over surfaces/obstacles about 7 inches high
…but will not hands and knees crawl. Will go into extended arm, will play on high knees (though isn’t a preferred position), will climb, etc. Now that he’s moving onto cruising, standing, and walking is it really THAT detrimental that he isn’t crawling on hands and knees?
He does see a PT already, he is getting AFOs made right now for extreme pronation, external tibial torsion, and hyper mobility. But to my knowledge none of that should cause a crawling concern.