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Then you need these to replicate on a tern:
The skeleton for child seat: https://www.ternbicycles.com/uk/accessories/471/clubhouse-0
The lower part of weather proof box that also replicates as a massive storage without child: https://www.ternbicycles.com/uk/accessories/471/storm-box (comes with a great cover called cargo lid)
The platform on which the box (its not a box just a heavy tarpaulin material) sits: https://www.ternbicycles.com/uk/accessories/471/sidekick-wide-decks
And the rain cover: https://www.ternbicycles.com/uk/accessories/471/storm-shieldI have this in front paired with a eurobox that can take upto 20kg of stuff: https://www.ternbicycles.com/uk/accessories/471/transporteur-rack
Within that whole child carrying 'system' at the back when they grow out of a seat like Yepp Maxi they can just sit directly into that cage that has bar tape on the sides to hold and comes with a cushion seat that is removable.
were you going to buy a canopy/rain cover for UA?