Hi I have a 4 month baby girl and she always screams when she goes in her pram and won't stop crying to the point where she starts coughing because she can't catch her breath. I tried her in her pushchair and there was no problem no crying full of giggles. I was wondering if this okay to do because I thought they have to be on there back for 6 months in the pram because of the spine development? Has anyone else had this problem? X