Ally all children progress at their own rate and I think boys are usually slower then girls.

Matthew will be 15 months on the 3rd August so not too much older then your DS, off the top of my head he`s up to at least 14 words - Mum, Dad, Mam, Nan, Ta, Cat, Cow, Up, Bye Bye, Hello, goat, book,car, bubbles - I have a feeling I`m missing something.

Do you see a Clinic Nurse? If your at all worried it might be worth talking to her but if I was in your shoes I`d give your son a few more months before I got too worried, you`ll probably find he`s advanced in other areas.

Take Care

Dee