|Awwww....mama, I'll bet your heart sank just like mine did when I saw a bald spot!
Firstly, what does the spot look like? Is it a defined boarder area, where the terry is normal length and then suddenly you have netting OR is it gradually reduced in length terry ending with netting in the center?
#1 is called a "splash mark".
#2 is called a "wear spot".
Sometimes a chemical can accidentially "splash" onto the fabric, gradually eating that area away to nothing, hence the appearance resembling a "splash".
Or, as mine are, wear spots. Like your jeans wear more by the pocket corners or knees, diapers get "worn" in certain areas faster than other areas. My bamboo(all 20 of them) have worn areas at the waist & now beginning at the legs.
ME warranties all of their diapers. They should last 1 child birth - PT. If you think you have pre-mature wear, you should contact ME directly and explain your situation.
FYI-Erika told me not to worry about my dipes, they will replace them once I feel that absorbancy is compromised. Right now, my spots are all cosmetic.