What are the weight and height requirements for using the Evenflo 4-in-1 Car Seat in rear-facing mode?

The rear-facing weight requirement is 1.8 - 18.1 kg (4 - 40 lbs) and the height requirement is 43 - 102 cm (17 - 40 in.). Additionally, the top of your child's head must be at least 2.5 cm (1 in.) or more below the top of the child restraint headrest. Once your child exceeds any of these size requirements, they must transition to forward-facing mode if possible, or discontinue use if under 2 years old. (Pages 4, 26)