My son is 3 1/2 months old and lately has not slept more than about 2 to 2 1/2 hour periods at night. Previously he was going about 4. I had planned to start the CIO method but do not know if he is too young. Right now, when he wakes up crying, I end up going in there and putting his paci back in, to which he falls right back asleep. Is this normal? Should I start CIO? Also, he has been a lot fussier during the day. Does anyone have any advice?

As much as it's driving you crazy, he's too young for cio, imo. I believe at the early end, Weissbluth suggests 4 months, but it seems to be a lot more successful if you wait until 6 months or so.

Re: the paci, it won't be too long before he'll have enough control to put it in himself and you won't have to go in there as often. I don't have any other advice for you, but hang in there.

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Andy