My DS is just 10 months. He was referred to a physio after his 8 month check to help with his mobililty as he was not rolling, crawling or sitting unsupported. He is now sitting for short periods and no longer flinging himself onto his back where he preferred to be, and is much happier sitting and playing though still a bit wobbly. He is a very happy, placid little boy who just isn't worried about moving around - he is very much a spectator when with other babies. He has now been referred to a paediatrician for assessment as he is scoring below average on his development chart - he isn't speaking yet either - is this normal - has anyone else had a similar experience - should I be worried?