This or That- 50/50 - One or the Other

One of my charming children-Chase-has learned to crawl on all fours! Most of you know he has been "army" crawling since the end of March. Some time last week he began using both forms of crawling. You never know which he is going to use. You may look over and see him on all 4s and we cheer, only to see him flop to his tummy and begin to pull himself-alternating front arms-across the ground. The only place I'm fairly certain he will crawl with his tummy off the ground, is on the grass. He doesn't like his knees or tummy to touch that grass. Watch this video-it's a perfect example of what I'm talking about. Chase starts out on his tummy and then pulls to his knees. Please ignore the background conversation Jeff is having with Owen regarding whoopie cushions. he he