My DS is 6 months old. I've still got him in the bassinet part of the pram and he sleeps beautifully. However it is becoming a bit of a squeeze! So I need to make the move to the stroller attachment. Silly question though, it came with a foot muff. Is this something I need to put on? Or not because of the warmer weather? Sorry for the silly question but clueless FTM here.