Size Guide - Happy Nappy

Happy Nappy Size Guide

Size Waist Thigh
Small - 0-3 Months 34-41cm 17-22cm
Medium- 3-6 Months 37-44cm 19-24cm
Large 6-12 Months 40-47cm 20-26cm
X Large - 12-24 Months 42-50cm 22-31cm
XX Large - 2-3 Years 44-52cm 26-33cm
3-4 Years 48-54cm 27-35cm
4-5 Years 56-62cm 29-37cm


To ensure a good fit the waist and leg bands should be a snug fit without any gaping to prevent leaks. Our products are manufactured to provide maximum comfort and performance. As children and especially babies vary so much in size, it is important to ensure you have the right fit for your child.