The First Years 630 - Manual (Page 7)

Section 4 - Use Recommendations
The First Years advises parents that children should use a child
restraint with a built-in harness system until they exceed the
weight or height limits specified by the manufacturer.
C630 True Fit Convertible Seat Rear Facing
Use Requirements:
This child restraint, without the upper seatback in a rear
facing position is, designed for use by children whose:
- W eight is between 5 and 22 lbs (2,3 and 10 kg), and
- Head is 1 inch below the top of the seat.
Child MUST meet BOTH of these requirements to use this
Convertible Seat without the upper seatback installed.
6
1”

5 to 22 lbs
Rear Facing
Use Only