Sleeping help!!!

Elizabeth • 28 year old, happily married! Two miscarriages within 8 months. Praying for our Rainbow baby*
My little guy will be 12 weeks tomorrow. We're still having a tough time getting him to sleep in one spot. Bassinet was a fail, rock & play seems to work until he wakes up for his first bottle at night - then the only other option is bringing him into bed. I need advice/ experiences on transitioning baby to the crib! I go back to work in a month and really don't want to have him sleeping in bed with us 😔 
Last night he lasted only an hour in the magic Merlin in his crib....