Britax G3 vs G4 Car Seats, What are the New Features?

Differences of G3 and G4 car seats from Britax

So you want to compare Britax G3 vs G4? As you may noticed Britax updated their line of car seats with a new series called G4. The previous models were called G3 models.

Many parents who want a Britax convertible want to be sure if it is worth to buy a G4 model rather than a G3 model which is slightly cheaper. So here we try to put the differences between these two lines of car seats.

The G4 Britax Convertibles will have:

  • Weight limits are now 65 lbs, which are 70 lbs. in previous models, (i.e. Marathon-70 G3, Advocate-70 G3). So weight limit of G4 models is 65 lbs. This, first seems to be a disadvantage but in fact most children reach the height limit before they weigh 70 lbs. so no problems here.
  • A new infant insert is designed for G4 family of car seats for children up to 22 lbs.
  • The HUGS design is redesigned, now it is more difficult for children to push down.
  • The G4 models comes with color-coded to easy identification of car seat type .

So these are the new features, the other features are same for same models. For example Britax Marathon G4 has all the features of Marathon 70-G3, plus new features of G4 seat and weight limit is 65 lbs.

Again Britax Advocate G4 has all the features of Advocate 70-G3, plus new features of G4 line of seats with a weight limit of 65 lbs.


Mom of three. Reviewing baby gear for 3 years.

5 thoughts on “Britax G3 vs G4 Car Seats, What are the New Features?

  1. I read on another website that the new Marathon G4’s HUgs will also be available for older Britax models 70-g3, so this is important and could be another reason other than the price to get a G3 one.

    1. Oh I did not know that they are updating the old ones, it will be great og course if you can find an updated version in stores. Thanks for the information.

    1. Thanks for the link many readers ask us the difference beetween Britax Marathon G3 and G4 these days, and they are also curious about new weight and height limits, I hope this will also help them to figure out the new features of this line of seats.

  2. Hello, my question is why Britax lower the weight limits from 70 lbs. to 65 lbs. is there any specific reasons for this change, I also see that other car seat manufacturers also coming with 65 lbs. models?

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