A simple rule of thumb is that, by their second birthday, children should be speaking in some two word sentences. This may be things like “mummy gone”. Health visitors know to refer children to speech and language therapists at the age of two if this is not happening. If you feel that your child falls into this group, then you need to speak to your health visitor or GP. Have a look at http://www.talkingpoint.org.uk which is a site brimful of information on speech and language development for parents, health visitors and other health professionals. The site houses an online quiz that you can do to see whether your child is meeting their language development milestones.