Help me buy a supportive car seat for my prem baby

Hi, I'm Mel. I had a premature baby called Milo born on 29th march, he weighed 1lb 15oz at birth. He's currently 34+3 days corrected - weighing 4lb 1oz, hopefully in the next 4-6 weeks Milo will be home. I thought we had a good car seat however after chats with "car seat safety UK" they have suggested Avionaut pixel pro for being the best one for us.

Unfortunately as some of you are aware we have spent 8 weeks in 3 different hospitals and have spend all our wedding savings on just living (food, drink, fuel etc.) so I am having to rely on the generosity of others. So I am asking for any type of support that you can give, thank you ❤️