How do I choose the right diaper pants size? 23 September 2020 14:38 Updated When choosing the diaper pants please refer to the classic diaper chart and choose one size above. For example, if your baby is a size 4 in our classic diapers, then you would have to take a size 5 for the diaper pants. 😉 Related articles How to choose the right diaper size? I ordered the wrong size of diapers, can I return them to you? What do the Little Big Change diapers look like? Can I choose the words on the diapers? What is the difference between the diapers and diaper pants?