Roll Over!

Jonah rolled from his tummy to his back!  He has been doing this for a few days now, but I always chalked it up to a fluke or the help of the whale pillow he was propped upon.  But today, without any assist, he very purposely turned twice in a row.  "Mommy, I do not want to lie on my tummy!"  (I understand this is a 4 month trick.)