Every baby is just a little different. We will deliver based on the age of your baby and if you find baby is outgrowing the current size, please send us an email and we will make sure you have the next size to try in your delivery. If you are sure you want to move to the next size, just email calgary@pumpkinsdiaperdelivery.net or call 403-771-0270 at least one day before your scheduled delivery day to have us make the necessary adjustments to the delivery. Pumpkin’s Diaper Delivery diapers come in 5 convenient sizes that range from newborn to toddler.