At my wits end...sleep child!!!

Lexi

My little guy has refused to sleep in his crib/rock and play/bassinet for any more than a few hours since birth. I used to sleep in the recliner with him until I went back to work, and then co sleeping seemed to be the only thing that worked to get him to not wake up 6x per night. Well here we are, he’s 15 months old, and will start the night in his crib just fine...but always end up screaming for mommy, and won’t stop until I bring him to our bed and sometimes he won’t sleep without a soppy of milk too. We have tried the whole going back in after certain times to comfort him and it hasn’t worked. We have tried just letting him cry until he falls asleep. Also doesn’t work. Idk what else to do!! New baby coming in March and we need to find a solution! I am tired and so frustrated, but feeling for my little man at the same time. Hate hearing him cry it out!😔 any suggestions??? Daddy and I are all ears!