Carryin' baby cargo on cargo bike

Think I'm gonna try and find a pre-isofix car seat to use in it though as it'll be smaller. Ratchet straps fasten reassuringly well.

A non Isofix seat might actually be what you want, one which fastens in place by the seatbelt. Have a look at a Joie Stages - it has a completely flat bottom so will sit happily on your flat base. It is held in place by the seatbelt going over the seat base, so a ratchet strap will do the same thing. The seat itself has a size zero insert so although it's quite big you can use it from newborn.

Have you got a photo of the baby / watermelon set up? Contemplating getting a Bulitt (because that is what is available here) with half an eye on future tiny humans.

haha - unfortunately not, I had the baby car seat facing backwards at the end of the cargo section, with the watermelon (large) wedged between the bottom of the car seat and the steerer end of the cargo section - sort of perched there so worked as a kind of baby footrest as well.

Have now shuffled the car seat so that it is still facing backwards but shifted to the steerer end so that there is more space behind, otherwise you lose all the space under the car seat backrest.

Also the baby has turned out to be very very round and not likely to fit in the car seat for long so moving on to one of these - https://hollandbikeshop.com/en-gb/bicycle-trailers/melia-baby-safety-seat/melia-baby-safety-seat-7-18-months/melia-bicycle-trailer-toddler-seat-aron-7-18-months/

Have a look at a Joie Stages - it has a completely flat bottom so will sit happily on your flat base

This sounds great, exactly the kind of info this thread is great for.

A neighbour offered us a pre isofix one which I'd like to test out but they have yet to deliver the goods.

Also, sticking with a militant 1 car seat policy so will wait till the baby has outgrown the current one before moving on.