Not rolling over?

Ali

My baby will be 6 months on the 28th. He’s rolled from back to belly 3 times in his 6 months, but never belly to back. Is there anyone else who’s baby doesn’t seem to roll? I’m bringing it up at his six month appointment, but should I be super concerned? My two others were rolling both ways by now. 🥺

Edited to add: his three roll overs were between 4-5 months, and he hasn’t rolled over in about a month