My little boy just turned five months a couple days ago, he started rolling consistently about 3 weeks ago both ways, and the last few days I’ve noticed he’s started to lift his back legs up, like bum in the sky when he’s on his belly but seems to be really frustrated that he can’t work out how to get his arms to work with it or lift his upper body up, did anyone else experience this and how long after did your baby start to crawl or any tips on helping him feel less frustrated.