Baby turns 3 months. How do you sleep training? She still wakes up every 2 hrs at night.

I'd say that 3 months is too young for sleep training (if you want to in the first place), their stomachs are still very small so they need their frequent milk feeds - they usually adjust their own schedules and will sleep better in the later months around 8-10 months old! In the meantime, please continue to feed your daughter on demand - it'll be over soon :)