My daughter was 4 months when she started the "army crawl" then she finally got her legs down after a while, but she finally got it at 5 months close to 6. she was kinda early, and everyone says it's because I got pregnant so soon after and she was "making room for the new baby." 😂😂 either way it's usually like 6-7 months, and when they get it down they do not stop! 😂😅

My daughter was a "late crawler" so it wasn't until like 9-10 months. I think the average is 6-7 months