My 3 month old son has the Joie i-Gemm car seat but after reading some posts on the A-Z of Rearfacing Facebook group I'm worried he's been in it incorrectly all this time 
So far I've taken out the newborn head insert because he looked so squished and uncomfortable and I've also taken the wedge out because the buckle was was so hard to clip in and felt extremely tight. It's easier to fasten now the wedge is out.
Is this wrong? I just have no idea about car seats and feel like there's so much to know. I would ask on one of the Facebook groups but posting is now turned off and I really need some advice here.
Anyone help?