Great question! The UPPAbaby Vista V2 comes with a bassinet that's approved for overnight sleep too! It's suitable from birth to 20 pounds or until your baby can push up on their hands and knees (whichever comes first). Typically babies outgrow the UPPAbaby bassinet around 4-6 months old. At that time, you can safely transition your baby to the stroller seat. If you feel your baby needs more support and comfort, you can purchase the Snug Seat, which fits right in the stroller seat. You can also use the Snug Seat from birth if your baby happens to not care for the bassinet - just remember to fully recline the seat.
Remember that the UPPAbaby bassinet can also be used on UPPAbaby's other strollers including the Cruz, Ridge, and Minu V2.