I agree with the others - I would say it's due to Imran's arrival. I've also heard that the regression (in whatever area it presents itself....speech, toilet training, self-feeding etc) can be at any point within the first few months in particular?

I know you must be worried, but I'd honestly say it's a reaction to things changing around him.

About him not touching his nose, I'd say he's asserting his independence as well!