Weight - The weight range from and to Fuzzi Bunz will fit

Average Build - Babies within the "average" range of the growth chart

Larger Build - Babies who fall in the 80+ percentile on the growth chart

Baby's Age - On average, what age range of baby each size Fuzzi Bunz will fit

Thigh - Approximate thigh measurements that each size Fuzzi Bunz will fit

Rise - The length of the diaper from front waist to back waist

To measure your baby's thighs
Measure where the elastic of a diaper would normally be - around the meatiest part of the baby's thigh.

To measure your baby's rise
Measure from mid-back at the waistline to slightly below his belly where his/her diaper normally would come up to.

• XS Fuzzi Bunz are for either preemie or very small babies - they will fit newborns very well, however, not for a very long time.
• Small Fuzzi Bunz will fit babies that are newborn (although they may be a tad big at first) through about 6 or 8 months of age when they are ready for the mediums.
• Medium Fuzzi Bunz will fit babies with either small or large thighs. Medium is our most popular size because babies stay in this size the longest! They will fit babies from about 4 months old (depending on their growth rate and size build) up to potty training stages.
• Large Fuzzi Bunz will generally not start fitting your baby until at the very least 12 months old or are in the weight range or very tall.
• Petite, Toddler and XL are specialty sizes. Mediums have been found from our size testing to fit better and for longer periods than the Petite size diaper for skinny toddlers. XL can be used for older potty training children or other circumstances where larger diaper is needed.

Disclaimer: Our Size Chart has recently been updated to reflect more up to date size data. Fuzzi Bunz diapers have NOT changed their sizes - only the size chart.