Uppababy Mesa i-Size Infant Car Seat JakeUppababy Mesa i Size Infant Car Seat The Uppababy Mesa i Size car seat in Jake is perfect for newborns and young babies up to approximately 14 months, and can be easily installed into your vehicle using the Mesa ISOFIX Base (sold separately, check your car's compatibility here). As an i Size car seat, the Uppababy Mesa is designed to be used rear facing for its entire life, up until your little one reaches 13 kg, and features energy absorbing memory