US Patent 9221487 Convertible stroller seat

A child seat has a seat bottom and a seat back pivotally joined to the seat bottom at a seat bight. The seat back and seat bottom are movable between a toddler seat position with the seat back raised to a non-parallel orientation relative to the seat bottom and a lie flat position with the seat back lowered to a generally parallel orientation relative to the seat bottom. A bassinet rail assembly has a foot rail portion and a head rail portion and is able to move to a bassinet wall configuration around a perimeter of and elevated above the child seat when the seat back is in the lie flat position.