boppy seat

Ashley • I crushed PCOS!!!! After almost 4 years of TTC my prayers have been answered. End of Sept baby!!!
My son is 8 days and we have been having him nap and sleep in a boppy seat and keeping him supported. I know it's not safe so I'm trying to transition him to pack in play/ crib this weekend and today he did not take it well, only would restless sleep for 30 mins. Please advise.