Differences between secure kids 300 and 400?

alake

New member
What is the main differences. Looking for one for Summer when we travel. She is 6 years 5 months old. She weighs 47 pounds, and stands 44 inches tall with a 14 inch torso. This will be used as a travel seat, so for flights and rental vehicles. Any help would be appreciated.
 
ADS

gigi

New member
I think they also have different wings/SIP. And the 400 has e3, right? Of course, we don't know how much of any of that is marketing.
 

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