My son is 14 months and we've been co-sleeping or partially co-sleeping since he was born. At first, it was just easier for me to breastfeed if he was already in bed with us, and I eventually learned how to feed him without even rolling over to switch sides and without even fully waking up myself. So more sleep for Mommy. He also napped in our bed (or on the couch). By the time he was about 7-8 months, he was just getting too active and too big and too likely to fall off the bed if we weren't there, so we started practicing napping in his crib and also starting the night off in his crib. We'd do our usual bedtime routine in his room, he'd go into his crib, and usually sleep there for 2-3 hours. Then he'd wake up, and I'd either bring him into bed with us or I'd join him in an extra bed we have in his room. Now, at 14 months, he'll sleep very well in his crib for at least 4-5 hours and sometimes straight through the night. If he wakes up, I bring him into bed with me. At this point, I'm pretty much sleeping every night in his room, and Daddy is sleeping alone in our room. For awhile that was fine because my husband struggles with sleep problems and this meant he was getting a better night too. But we're starting to miss each other, so we're slowly working towards getting me back in my own room and our son staying the whole night in his crib. Personally, I have loved co-sleeping. I work full-time and enjoy the extra closeness at night. I made a brief attempt at letting my son CIO when he was younger, but I couldn't stand it and decided it was just not for us. Co-sleeping and our modified arrangement has simply meant, bottom line, that all three of us have gotten enough sleep, and that's HUGE. I'd say do it as long as you want to, and if you want something to change about the way it's working for you, just work on making that change very slowly and gradually. I never thought my son would sleep in his crib ever, and now he goes to sleep in it without a peep and sometimes stays all night.