We bought our buzz off ebay and it didn't have the newborn seat (didn't realise this existed at the time). I am currently bidding on a "QUINNY BUZZ 1st STAGE MEMORY FOAM SEAT COVER" like this one
cgi.ebay.co.uk/2009-QUINNY-BUZZ-MEMORY-FOAM-SEAT-COVER-STORM-BLACK-NEW-/290440286501?cmd=Vi ewItem&pt=UKBabyBabyTravelPushchairsGL&hash=item439f971125
Is this what I need to change the larger seat into one suitable for my 4 month old ?