Bedtime

Any tips to get your little on to sleep in their bed? My 6 month old has always been great at sleeping, we used to get him to sleep with us downstairs and lay him in between us until we went to bed and that worked fine for us. He started to wake up though a couple of weeks ago so I thought it was time for him to go to bed on his own upstairs. The first few nights weren’t too bad he woke up unsettled a couple of times and I got him back to sleep which was fine. But the past few nights when I put him down (asleep) he wakes up and starts screaming until I pick him up and every time I settle him and put him back down he starts screaming. I don’t know what the answer is! He won’t go down awake either 😩