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Britax B-Safe Gen2 FlexFit+

The Britax B-Safe Gen2 FlexFit+ rear-faces up to 35 lb and has an expiration of 6 years, per Britax.

DiscontinuedNo longer made or sold new. Specs are kept for comparing generations.

  • 35 lbRear-facing to
See it on Britax's site

When does it expire?

Follow Britax

All infant car seats

B-Safe Gen2 FlexFit+: key facts

  • The Britax B-Safe Gen2 FlexFit+ rear-faces from 4 to 35 lb and up to 32 in tall, per Britax.
  • Outgrown by height: "when the top of the head is 1in (2.5 cm) or more below the top of the child seat shell"
  • Britax says it expires 6 years after the date of manufacture.
  • Britax lists it as certified for aircraft ("This Restraint is Certified For Use in Motor Vehicles and Aircraft.").

From Britax's published specs. Always follow the limits on your seat's labels.

How the B-Safe Gen2 FlexFit+ stacks up

Against the 75 infant car seats we track. The shaded band is where the middle half of them fall; the dot is this one.

Expiration6 years

Within the typical range for infant car seats (6 years to 8 years).

This one
6 yearsmiddle 7 years10 years
Rear-facing limit35 lbHighest rear-facing limit of 74 infant car seats

Above the 30 lb most infant car seats list.

This one
22 lbmiddle 30 lb35 lb

Flying with the B-Safe Gen2 FlexFit+

Britax's label: “This Restraint is Certified For Use in Motor Vehicles and Aircraft.”

What airlines say about car seats:

  • American: “Each ticketed customer is allowed 1 stroller and 1 car seat to be checked free of charge” “If an unoccupied, adjoining seat is not available, the gate agent will check the safety seat to your final destination.” Source
  • Alaska: “We will transport your child's car seat and stroller free of charge as checked baggage.” Source
  • JetBlue: “Checking a child safety seat will not count towards your checked baggage allowance and there is no fee assessed” Source
  • Spirit: “One (1) car seat will be accepted per child as checked baggage at no charge.” Source
  • Frontier: “strollers and car seats can be checked for free.” Source
  • Allegiant: “There is no charge for checking or gate checking one car seat per fare-paying passenger.” Source
  • Breeze: “Child seats may be carried on board the aircraft if a seat has been purchased for the Infant or Child” Source

Quoted from each airline's page as of 2026-11-02.

Where to buy the B-Safe Gen2 FlexFit+

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good to know
  • Discontinued. You may still find it used or on clearance.
  • Check for recalls: Search the agency's recall list with the model number and date code from the label: NHTSA recall search.
  • Car seat use and installation: see NHTSA's car seat page, which also lists free car seat inspection by certified technicians. Check the label and the maker's instructions, and ask your pediatrician about your child.

Full specs

Britax B-Safe Gen2 FlexFit+
TypeInfant car seat
Rear-facing weight4–35 lb
Rear-facing heightUp to 32 in
Head rulewhen the top of the head is 1in (2.5 cm) or more below the top of the child seat shell
Anti-rebound barYes
Aircraft labelCertified for aircraft, per the maker
Expires after6 years

Compare the B-Safe Gen2 FlexFit+ with

How each closest rival differs from the B-Safe Gen2 FlexFit+, from the makers' specs.

Ask the meadow

B-Safe Gen2 FlexFit+: questions answered

From Britax's published specs, last checked 2026-11-06.

Does the Britax B-Safe Gen2 FlexFit+ rear-face longer than other infant seats?

Yes. Its 35 lb rear-facing limit is the highest of the 97 infant seats we track, tied with 22.

Can you bring the Britax B-Safe Gen2 FlexFit+ on a plane?

Yes, Britax lists it as certified for aircraft; look for the red-lettered label that says so. The FAA asks that a car seat go in a window seat so it doesn't block the aisle, and the crew will look for that label.

B-Safe Gen2 FlexFit+ or LiteMax DLX: what's different?

By the makers' specs, the B-Safe Gen2 FlexFit+ has an anti-rebound bar; the LiteMax DLX has a load leg. See every spec side by side.

Is it OK to buy a used B-Safe Gen2 FlexFit+?

NHTSA publishes guidance on used car seats on its car seat page. Britax lists a lifespan of 6 years from manufacture for this model. Check the label and the maker's instructions, and ask your pediatrician about your child.

Still wondering? Write to us at hello@cribpicks.com and we'll look it up.

More infant car seats

Where these specs come from

Last checked 2026-11-06. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.