14 month sleep regression - 2:30am wake up help

[Franktank19]

Morning
My baby has always been a great sleeper and slept through. For the past month he is now waking up at 2:30/3:00 everyday.
I did try to not react and let him cry it out but not only is that horrible to hear, we live in a flat and I am so aware of him waking everyone up also the more he cries the more he wakes himself up. I now give him a bottle and he usually goes back to sleep ( sometimes not and it can take him an hour) but I am finding the broken sleep hard.
Any advice to try? He has his white noise on

Don't leave your baby to cry by themselves in the middle of the night! Fine if he's having a little grumble and sorting himself out to go back to sleep, but CIO is simply not an acceptable thing to do to a baby. Or a toddler, or a child, or an adult!

How does he fall asleep? If he isn't self settling, i would work on that first, as if he needs milk/cuddles/rocking to get to sleep at bedtime, of course he's going to need that in the night.