Hi - I'm new to this - but desperately need some help. My DS is 3 1/2 months old and won't go to sleep on his own. He has never done this but now also screams when walked around or rocked. If I try to put him in his crib he just cries and cries and no amount of stroking or patting helps. It can take us up to 3 hours to get him to sleep in the evening and I am SO tired, especially since he wakes up every 2 hours during the night. Any suggestions??