DS has always been a decent sleeper. At 8 weeks he only woke up twice a night and at 4 months it dropped down to once a night and finally at around 7-8 months he started sleeping through the night. We never had to sleep train him, he just started doing it on his own.
We don't have the best bed time routine - he goes to bed at the same time every night but we usually give him a bottle right before bed which makes him drowsy, rock him a little and try and put him down when he's drowsy but awake (this doesn't always happen and DH prefers to have him sleep in his arms and then put him down).
Well, we recently took a 2 week international trip to South East Asia (13 hour time difference) and since we have been back, DS consistently wakes up once a night and it is getting harder to put him back to sleep. At first I thought it was the jet lag but we have been back a month and he is still doing this. Plus we started taking him to bed with us when he wakes up until he falls back asleep and then put him back in his crib. Oh, and we give him a bottle when he wakes up which we have been doing since he was born.
I think it is time to sleep train him and my plan is to change up his bed time routine so that he doesn't get a bottle right before bed (so that it's no longer a sleep crutch for him) and stop rocking him to sleep in our arms. When he does wake up, I'm planning to gradually reduce the amount of milk in his bottle and again stop rocking him to sleep in the middle of the night. I have considered the walk in/walk out method but whenever I have let him cry a little, the crying just escalates and he never seems to calm down. I do have to admit though that I have never let him cry more than 10 minutes.
Do you guys have any suggestions for sleep training an older baby?
Edit: Sorry for the essay!