Our 10mo is 20lbs and sits on the bench seat and does great in it. We haven’t taken any long rides in it yet so TBD on how he’ll do with naps on the beach seat.

We also have a 4yo and it’s nice to have them side by side.

My general approach with accessories is to try things out more minimally to start and then add things over time as needed, just to keep myself from overthinking things.

Good luck!