Our newborn inserts absorb 8 oz. They are made entirely of bamboo, a 100% natural fiber. /Fold in 3 lengthwise they can be used for new layers-born and when the child has grown up they can be folded in 2 across to be used as ''booster'' in a single size or Large layer. Our inserts can be washed and machine dried but dry very quickly hanging. Do not use a softener in the dryer (in no stirring) as it will foul the insert and reduce its performance. For maximum absorption, it is suggested that you wash them 5-6 times before first use.