My DS is 5.5 months old. For the last few weeks he's been crawling backwards. Since about 7 weeks he's slept on his tummy, which I know is why he's likely to be crawling so early.
He's got really good core strength - able to hold a plank (!) and is also sitting unaided for long periods. Also likes to stand up and "jump" up and down.
But he's not rolling and has ZERO interest in trying to.
I'm not worried, but should I be??