3 weeks old and trouble sleeping

Shay-lea

My son was born September 25th and is breastfed mostly besides some formula supplementing. I can not get him to sleep anywhere but my arms. He will be dead asleep and as soon as I put him in his bassinet or pack n play or swing, or doesn't matter where, he immediately wakes up! I'm a first time mom and my fiancé is struggling with me. I will cover the night/ morning shift and he will take over and let me sleep. ANY tips would be appreciated!