Graco Extend2Fit Instruction Manual page 36

When reading the level indicator,
Vehicle MUST be on level ground.
Use corrected age for preemies.
- If the bubble is entirely under the light blue
line, the restraint is level for infants
0+ months in age.
- If the bubble is entirely under the dark
blue line, the restraint is level for a child 3+
months in age.
- If the bubble is not completely under the blue
lines, the child restraint is NOT level. You
must adjust your recline position.
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