Yeah, I would just do what you're doing. That's all I do, just talk to them all the time about everything we're doing and DD1 is a chatterbox and DD2 said her first word at 5.5 months. I think there's just sooooo much variation on what's 'normal'. They have a what is called a 'language explosion' around 18 months - 2 yrs. One day she will just all of a sudden 'get it' and start learning heaps of new words every day! It's amazing!