Is it crawling if they don't use their arms and legs together?

Question

My mom bet me that my baby would be crawling within a week and said that she won the bet when I sent the latest video. My baby uses his arms to kind of pull himself while on his knees but his legs just kind of move with no real assistance. 
I say it isn't crawling until the arms and legs move together.

Answer

I guess it’s open to interpretation because there are different types of crawls (like army crawl, bear crawl), but for the purposes of the bet and in the context of “my baby started crawling at X months” I would think crawling on hands and knees (taking “steps” with alternating knees and coordinating with the opposite hand)

Answer

That’s probably more like lunging and I wouldn’t personally call it crawling. My second daughter did that before she actually started to crawl.

Is it crawling if they don't use their arms and legs together?

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