Please cut the grapes, and everything else that has the potential for choking. I was a pediatric nurse at a local hospital and unfortunately, we saw many children who were served grapes that were not cut up. The child that stands out for me is the 3 1/2 year old, who was being cared for by his grandmother for an afternoon. These preventable tragedies never leave your mind, as a mom. I am not trying to be an alarmist, but one of the earlier responses was correct, until 4-5.
This is something to also talk about with anyone who might be caring for your child, and may not have heard these guidelines, like a grandparent, or other family member.
In fact, my pre-school had the policy for all the children, including the young 5's.
Kids can do really well 99% of the time with the whole grape, and only one time have an issue, if they get excited by something and take a deep breath while eating.
This time of year, also keep them away from hard candies.