I believe it has to do with the center of gravity and the fact that those seats "perch" up on top of the front.
Although I will say that my 7 month old is in a low % for weight - 16 lbs., and her bucket weighs almost 15 lbs, so she is getting close to the limit that way - I am amazed how many older babies (9+ months and BIG) I see still in those buckets on the carts. They are definitely over the limit when combined with bucket weight. Surely they can sit up by now? I know mine was early, but she has been sitting in the shopping cart seat since she was 6 months.
Although I will say that my 7 month old is in a low % for weight - 16 lbs., and her bucket weighs almost 15 lbs, so she is getting close to the limit that way - I am amazed how many older babies (9+ months and BIG) I see still in those buckets on the carts. They are definitely over the limit when combined with bucket weight. Surely they can sit up by now? I know mine was early, but she has been sitting in the shopping cart seat since she was 6 months.





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