It's not a bad habit to continue co-sleeping past that age either, provided it's working well for the family. All three of my kids did 'til they were 2, then transferred relatively easily to a bed (gradual process) and have been sound sleepers in their own beds and rooms since then.dwayne said:Babies don't know how to manipulate w/ their cries until 5-6 months, and if you don't mind sleeping with him, you are NOT causing him any harm or starting any habits by doing so until that age. Does he sleep in the car? My best friend's son ONLY sleeps in the car, and in the car seat in his crib! Swings, bouncy seats, exersaucers, etc... are all ok for a baby to sleep in as well -- wherever they sleep, let them sleep!
If I were in your shoes, I'd co-sleep until 5-6 months, try the crib again and CIO if necessary. . . Good luck!!!
Just one word of caution about constantly sleeping in car seats...it's not good for their spines to constantly sleep in one (ie for every nap and all night long). I had a friend who's baby only slept in one too...and she had to work to get him broken of the habit. Just like an older child and adult, babies need to be able to move around in their sleep, and a bucket seat is just too restrictive.