What does roll over exactly mean? Is it rolling over from back to tummy ? Or is it sliding side to side from one place to another?

Back to tummy first...then side..
Have little bit of tummy time and keep a watch...

When To Start Tummy Time And How It Helps

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Hi Rolling over and chin up is one milestone, they will roll over from back to tummy and lift their chin up. It takes another few months to roll back n forth themselves.

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