11 month old sleep

[MummyToABoyy]

I have an 11 month old DS who hasn't quite mastered the thing called 'sleep'. He's always had a solid bedtime routine and but no matter what I do, he still wakes up upset during the night (last time was 4 times from 11pm-5am) and can sometimes take a while for him to settle back off to sleep during these wake ups. He has a bottle at bedtime and settles himself off, but always wakes after 45 minutes or so which I then offer a bit more bottle (mostly takes a couple of ounces before bed then pushes bottle away). Sometimes he goes straight back off again once he's rolled over and got comfy, sometimes he is upset (if he's teething it can take a lot longer).
I've seen a sleep consultant and she's advised everything I'm doing is brilliant and to keep at it, but out of curiosity, does anyone else's baby still do this at 11 months old?
He has had a lot of teeth appear within the past couple of months so I'm taking that into consideration, but he is the same teething or not.
We go on holiday later in the year and our DS is staying with my parents so I'm really trying to knuckle down on this sleep malarkey as I am extremely nervous about leaving him if he still isn't great at night!
I have tried every single thing to encourage him to sleep, but it doesn't seem to improve. The best I get is a full nights sleep maybe every month-every 2 months, other than that I spend more time sat beside his cot on the floor than in my own bed.
Besides that, he's an absolute wonderful little being

Does he fall asleep while drinking his milk? And is more offered everytime he wakes up? If so then that's too much of an association that he needs gone, especially now he is getting older.

45 mins wake up after initially going to sleep is usually over tiredness. How are naps?

Can't offer much advice but watching with interest too...

Interesting to know what naps he takes too.

My DD, 10 months, started refusing naps last week or so. I've put some of it down to teething. She also has a solid bedtime...
Down 7.30pm...will wake after 30/40 mins then back down 8.30pm until often midnight and then through to 8/8.30am.
I'm wondering if she's sleeping too much now hence the nap refusing!!!

Be keen to hear what others say....

No milk isn't offered everytime and I don't always offer his bottle when he wakes up after 45 minutes. The sleep consultant told me that this is his sleep cycle that I need to break somehow but it is difficult!
He wakes up 6am, 1st nap is around 9:30 for 45 minutes.
2nd nap is between 12:30/1 and he has as long as he wants (usually 1hr 20 minutes on average) then he's awake and wants to get up!
His bedtime is 6am as anything after is too late for him and he then gets OT! He likes to go to bed early.
He doesn't fall asleep drinking milk, he self soothes day and night. It's just the waking that's a mystery! Teeth? Tummy ache? Who knows!