It is generally advisable to measure the size of the child before purchasing an item. Children's actual sizes are not necessarily the same as standard age measurements. Different styles of dresses also differ in size. If you still find that the size is not right after the purchase, you have 7 days to request an exchange. However this is subject to availability of stock. Our dresses are in limited numbers. Unfortunately, we do not pay the postage charge for your returning the item but the exchanged parcel would be posted free of charge. Please also read our Returns Policy