My son is a week away from 12 months and he isn't showing any interest in mocking anything. He doesn't clap, wave or when we ask how big he is, won't put his hands up. We have been trying for over a month and he just doesn't pay attention hardly or try. He can 'clap' with two toys in his hands because he loves to bang them together, but won't bring his hands together if they are free of toys. I know all babies do things at different paces, but is there an age where this might be worrisome? TIA!