Hello, my baby loves his britax rock a tot car seat and hates his bugaboo frog pram. I think he likes being more upright... As far as I can tell there's no way of attaching britax to bugaboo base so wondering what to do? Anyone got any ideas? I guess I could buy a maxi cosi seat as these attach to the bugaboo base. I guess you can get sun shades and rain covers for these? He is 11 weeks so not sitting up yet but I'm also wondering when I will need to change to a more upright style buggy anyway? thanks for any advice for a first time mum getting hot wearing the sling all the time in the sun!