Hi Mary thank you for your enquiry, there are a few differences between the two, the 400 has a more modern look however, the 300 has a higher limit for Booster, we would suggest adding them to our compare products option on the website so that you can look to see the differences. We hope this helps. ?For further information on this or any of our other products available, if you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have. We hope this has helped with your query.
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