I used to peel them at this age and then cut into little pieces. As they get older (Alex is 22 Months) you can get away with cutting them, but I don't think that the skin is really beneficial, I remember the story about the little girl who died, she was 2 years old and swallowed a grape whole and she choked. Awful, I visit a playgroup who offer grapes, but I told the playleader about it and she now cuts them into quarters.