what can u do to get a 3 week old with acid reflex to go to sleep

we have a swing

Get the rock and play sleeper. Their head is safely elevated so it elimates their acid reflux when they sleep, so they sleep longer. All my daughters had it and they all slept in there until they were 5 months

and I tried that when we were still at the hospital and it didn't work

I have a girl

Swaddle him really well and rock and pat or stand up and sway... it worked for mine