I have to share this with you :
"Dr Miriam Stoppard's New Baby Care Book
a practical guide to the first three years
published 1990, reprinted 1998
Backward Babies
Babies develop at all speeds from very fast to very slow and it can be difficult to distinguish normal slowness from backwardness. If you feel that your baby is not really keeping up with the general social milestone, consult your doctor. However minor defects may not show up for several months, so follow your instincts if you suspect that your baby is not developing quite normally and seek early help. The earlier you get help the greater chance you have of dealing with the abnormality, and preventing the baby, the family, you and your partner from suffering unecessarily.
If in addition to being socially backward, your baby's physical development is abnormal, then the burden of looking after the child can be a great strain. In reality the parents have to continue to look after such a child like a newborn baby, seeing to its every need. This can result in a deteriorating atmosphere within the home, and in such cases you must seek help. It's often comforting, as well as actively helpful, to talk to people in similar situations so check your local directories for groups as well as contacting any relevant national agencies"
I cant tell you how unhelpful this was to me when dd was born in 1999 and did not develop normally. Infact it has made me quite angry to type it out now