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Hello, the child crawls on all fours, trying to stand on hands and knees, but can't with his arms (it looks like a crane ?, he gets into the top position like a bridge, while his head is stuck in the floor) because of this he starts getting nervous, sometimes crying. I try to help him, but he doesn't want it anyway, he starts crying when I hold him by the hands. But with his hands he works very actively, but he can't get up.