Dylan is 16 months old and his fontanelle is still about 4cm.. it's bigger than Reuben's and he's only 3 months, doesn't seem to have got any smaller at all!? Could it be a sign of something wrong? They used forceps when he was born and he had a swelling on the side of his head (which midwife said was normal), then had a flat head on the same side till he started sitting up, could that have anything to do with it?! Sorry, questions questions! 
