We just did it this past weekend. Mostly because I was out of town with her and was too lazy to take the PnP out of my trunk, so into the crib she went! It has made no difference in her awful sleeping habits...I just have to walk farther to get to her.
I put my LO in his crib first night home from the hospital. He has never had a problem and goes to sleep great in it, he loves it. Sleeps 12 - 14 hours every night..
Re: LO sleeping in bed yet?
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4 weeks.. i couldn't sleep with her in our room. we transitioned her by having her do naps in her crib first.