5mo uncooperative drinking milk

Hi, my baby is slightly more than 5mo. Recently he keeps turning his head away when we feed him. He’ll suck once or twice then turn away. But he doesn’t fight or struggle and does want to drink. He’ll open his mouth eagerly when we bring the bottle near but again suck twice and turn away. It’s not a teat problem as we just changed not long ago. Just want to check if anyone else has this problem? And is it normal and why?