I've always been really into kids' and babies' sleeping habits. It's an amazing thing. Habits are so addicting! That first year can make or break the person's sleeping habits. I read and listened to our pediatrician for advice. When V was over six months old we finally let her cry it out. 4+ hours of the most torturous hours of my life.
With Christian I only waited until he was 5 months and he only cried for 40 min and then was the most champion sleeper I had ever seen or heard of. Amazing. You'd put him in his crib at 6:30, awake and get him out at 6:30 am and he was the happiest baby never making a peek through the entire TWELVE hours!
When Brecken was a few weeks old I happened to stumble upon an old blog post of a blog I like and trust (she was a teacher) about how she sleep trained at 3 months old!!! I thought they had to be able to sleep through the night without eating to be able to do it.
So I began soon after Brecken turned three months. He had already had some pretty good habits. I could put him down right after feeding at night and he'd put himself to sleep. I'm sure it helped that I went to pump and he was just put down and I wasn't there for 20 min. even if I wanted to be.
In the last week we've gone from him crying for 15-25 minutes each night after his critical bedtime routine at the same time each night for several nights. Tonight he cried for 3 min.
Then he laid there and put himself to sleep.
Just call me the Baby Sleep Whisperer.......
Or the lady who has three kids and sleep is important.