First of all I would only do it when you're ready - not because your mum is at you!! It's okay to introduce it at one, and since you have been using it in his food anyway i imagine it woud be quite easy. I havne't done it with daughter as she may be allergic but my friends said they started giving small amounts in sippy cup, sometimes mixed with water or bmilk to tone down the flavour. Not sure how cold it should be! Well done on the bfeeding! I know others here will have some good tips.