We simply mean that we want your child to be in the best peer group for them. For example, not all 2 year olds are the same. A 24 month old and a 35 month old child could potentially be doing a lot of different things. We place children in classes with other children close to their chronological age, but pay attention to their development and allow for a little wiggle room if we, along with parent input, feel like an older or younger peer group might be a better fit for them. Just because you have a birthday does not mean you have to move on to a new class.