A v-shaped pillow could work.

I just used to prop dd up against the hood

a rolled-up blanket behind her helped a bit too

eventually she fell asleep anyway so you need to be able to get whatever you use out without waking her

like this

might be a bit wide for a carrycot, i suppose, but if you could wedge it, then it might provide even more support?

I'm sure I've seen one that fits around babies to help prop them up a bit.

hold on, will google

Thanks, yes, more sat up than a wedge,

Aren't BFing cusions huge?

do you mean sat up upright, or just not lying totally flat?

there are wedge pillows you can get for babies, am sure I have seen them

or alternatively, if you mean upright, maybe a bf type pillow around her bum +lower back for support?

DD is 7 months old and can sit up but not so steadily, I'd like to continuue to use her carrycot after 6 months, Ive got a harness for it but can you buy something to put in it tio help her keep sat up?

Thanks x