My 3 weeks old baby will only sleep if me or my husband is holding him. Why?

If we put him in his bassinet or swing, he cries and will eventually start to scream at the top of his lungs. He does this all day and all night. What can we do?My 3 weeks old baby will only sleep if me or my husband is holding him. Why?
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Once I knew why he was crying it made life SOOO much simplierMy 3 weeks old baby will only sleep if me or my husband is holding him. Why?
Try swaddling him. He's used to being in very close quarters and to go from feeling your heart beat and being all snuggled up to you to then being placed in a bassinet that isn't warm like you or snuggly like you is a shock. Swaddle him tightly and warm up his bassinet with a heating pad. Then, take the heating pad out and lay your son in the bassinet. It will be warm long enough for him to get good and asleep. We had to do this for a week or so until our son got used to sleeping in the bassinet. We spent the first ten days of his life holding him so he could sleep--it got exhausting, and it was all I could think to do to keep from going crazy. It will get better eventually, too.
Try swaddling as the above responders suggested. I know for us, using a pacifier worked really well, since our baby was very ';sucky.'; Make sure the room is dark and use some white noise like a loud fan or a CD playing continuous sounds. You can try ';rocking'; or rolling the bassinet until he falls asleep at first. Good luck!
its the warmth, and the comfort. he just spent nine months in a warm little spot tucked inside you :) try soft music. they have music players that sound like womb sounds. my son really took to the nature sounds. also stuffed animals that play music too. my son was like this as well. of course, he also had acid reflux. might want to check into that as well. his stomach was getting upset after feeding him...we thought it was a sleep issue, instead it was a issue of baby being in pain. acid reflux is quite common. he was put on med and did much better.
Yeah, try swaddling him really tight and making sure he is warm since they came from a small and tight place after all. Sounds already bad that he's use to being already hold...so break this if you can while he still very young or it will be hard for you later.