Are you using formula or expressed breast milk in the bottles? Or did you switch to cows milk in the bottle as he is so close to 1yo?
Just wondering now if switching to bottle at the nap and BT feeds might make you feel like you are making more progress? Although you say you'd like to wean BF at 13 months. Just trying to get a picture of what you want to happen.
It's perfectly possible now, at 12 months, to stop BF and stop milk feeds (bottle or breast) at nap and BT and keep milk totally separate from sleep. LO does still need some milk (usually twice per day), this can be breast, formula or cows milk and can be given in a bottle, sippy cup, straw cup or open cup (it is advised to drop bottles at 12 months - just as you bought one! But it is helping you just now so it wasn't a waste
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It's also perfectly possible to stop feeding mid nap and through the night.
I notice in your recent EASY that there are no solids snacks. When you started this thread your LO was 10 months and at that age I wouldn't always expect to see snacks included, but now he is almost 1yo, a "normal" or common routine would be
WU milk
breakfast
mid morning snack
lunch
mid afternoon snack
dinner
(when weaning the BT milk at 12 months I put in a supper snack with milk in a cup here)
BT milk
I think if you were to introduce a snack time mid-morning, keep a milk drink after lunch solids, and are prepared for some resistance (him crying) you can go ahead and stop the pre-nap BF. You would stay with him throughout the process (no crying alone) picking up if needed and continuing to sooth in the cot until he is either calm or asleep. You can either just go for it (and he will adjust over the next few days) or you can wait a few days whilst you get that snack introduced and either bottle or breast at nap time, reducing just as you have been doing and then stop.
I would probably keep the BT milk feed for now and tackle it a little later. But you could switch to a bottle at BT instead of the BF if you wanted.
Even with keeping the BT milk you can introduce a supper (snack size or however much he wants to eat plus milk in cup or bottle) just prior to his BT routine bath etc and this will help to fill him up ready for the night.
Night feeds are not needed after 1yo (although people who choose to continue to BF may choose to keep night feeds for longer) so you can drop these and give comfort or water to help your LO settle back to sleep.
I think you are ready to make some changes so I'd just go ahead and make them. He is sleeping pretty well and he is old enough to get his nutrients from mainly solids, milk at this age is now a drink and part of a balanced diet, he needs the dairy for fats and nutrition but no longer for hunger.
I keep hearing stories of it working with friends
We often don't hear the full picture from friends. And even if you do, you don't know the knock on effect of their parenting methods down the line.
I k now you want changes so it's time to do it, just not the CIO way.
You can do this. Stay calm, stay supportive, do one thing at a time but be focused on your goal and feel confident that your LO is going to be okay with fewer (or no) BF. It is not the same as when he was struggling on two naps - you have a pretty good routine. Your just ready to cut those feeds for your own sanity I think.
OK?