OK. This was the exact same thing that brought me to this board in the first place. Alex would go to sleep but wake during the night and I would end up giving her bottles of milk to settle her. Something had to stop. So I did walk in Walk out and it worked, but eventually.
Tatumsmum, when you say that you tried PUPD and WIWO, what happened exactly and how long did you try it for.
These things won't improve overnight, it can take up to 2 weeks. But really, if you keep giving milk, that is what they will wake for.
So firstly, would say to everyone here, ensure that naps are ok, I would suggest either a short nap in the morning and a good afternoon nap or (if switched ok to 1 nap) a good afternoon nap, waking around 3pm and going to bed no later than 7-7.30pm. Also ensure that there is no other problem, ie teething, colds etc. Check that they are not hungry (I always offer a snack just before bedtime routine, just in case, then I would advise for a toddler WIWO.
Don't be alarmed if this method lasts for 1-2 hours when you first do it, it is tiring, so get an early night and resign yourself to the fact that you will be up and for quite a while, your baby will fight it and try as hard as possible for a bottle of milk, and if you give in then it will be even longer when you try it again and it will confuse your lo. So please keep at it, and give it at least 2 weeks before you give up on it.
I hope this helps.