Hi. My little boy has recently mastered sitting up and has now moved on to crawling... All he wants to do it be on his belly shouting with frustration as he wiggles around! I remember he did this for rolling over too. My question is, any ideas on how long it’ll take him now he’s set his mind to it?? Am I in for weeks of this shouting?! He seems to know what to do with his arms and legs but can’t lift his belly.