How long can you use a Britax Marathon car seat?

10 years
Britax Expiration Dates and Where to Find Expiration Date on Britax Car Seat

model	expiration date
Marathon ClickTight Convertible Car Seat	10 years after the date of manufacture.
Britax® Essentials™ Allegiance	10 years after the date of manufacture.
Britax® Essentials™ Emblem	10 years after the date of manufacture.

How long is a Britax Marathon ClickTight good for?

ClickTight Convertible car seats have a useable life of 10 years. Harness-2-Booster seats have a useable life of 9 years. Belt-Positioning Booster seats have a useable life of 6 or 10 years. Refer to the user guide of your specific belt-positioning booster seat.

What car seat should a 20lb baby be in?

When your child outgrows her infant seat, the right car seat for your child is a convertible car seat. Convertible seats are so called because they can generally be used rear-facing for infants from 5 to 35 pounds, then converted to a forward-facing position for use with toddlers 20 to 65 pounds.

Is Britax Marathon safe?

The Britax Marathon ClickTight is considered one of the easiest car seats to install for this reason. In fact, the National Highway Traffic Safety Administration (NHTSA) awarded Britax with a five-star Ease of Use rating.

What is the weight limit for Britax car seat?

BRITAX INFANT CAR SEATS Fit children from birth to 35 pounds (15.9 kgs), are rear-facing only, and offer the convenience of transporting sleeping baby from car to stroller and back again.

How old are babies when they are 15 pounds?

Weight Chart