Crawling

Johanna • First time mommy to Max, born September 5th 2016 ❤️
My baby is crawling by pushing himself forward with his feet. He gets up on his hands and knees and instead of crawling on his knees he'll just do a sort of "caterpillar" type of movement, extending his hands then pushing himself with his feet.
At first I thought it would just be an intermediary phase while he's getting the hang of it, but it's been almost a month since he started. Have your babies done this or did they just start crawling full on?