Anyone else’s 6 month old not sitting yet?

SH

My little guy is 13+ lbs at 6 1/2 months. He’s not sitting yet and I still have to start feeding him baby food consistently (he has started but not consistent) so his main source of calories is still BM. Everything else looks normal the drs said (today at his appt). My first guy started sitting by this time so just a little curious.