K.,
My daughter is 7.5 months old and I think we're in a similar place right now. She's definately not as interested in nursing as she once was because she's too busy trying to figure out what's going on in the world around here. I offer frequently but she usually either won't latch on or will only eat for a few minutes. I try to get better sessions in when she's either falling asleep or waking up. So far though, her diaper count remains good.
Are you planning to continue pumping for his bottles or switching him to formula? My personal preference is for my daughter not to have formula. Especially with all the other prices that are rising - not buying formula is a huge deal to us.
We also introduced a sippy and are working on becoming more competent with it. As soon as she is consistenly taking it and not spitting so much, I'm going to put away all her bottles. DD only gets the occasional bottle, maybe 2-3 times per month, but I still can't wait to be done with them. As long as he is comfortable with one, I don't see any reason why you couldn't just go right to that - it's what we plan to do.
We've also started working on nursing manners. I plan to nurse until Taylor self weans which I'm hoping will fall in the 18 month - 24 month range. She's definately started to try chomping down a few times - and she doesn't have any teeth yet. We also just worked through an extremely painful change in her latch. Every time gets lazy and I can feel her latch start to be painful, I pop her off and relatch her. If she pops off more than 3 times to look around, the session is done. If she's "biting" she gets one warning to be gentle, then the session is done. It's rough right now, but I know that laying this groundwork now will make for a better relationship down the road.
Good luck to you,
S.