Diaper dimensions by brand in inches

Length Crotch Back Front
Newborn size
Kinderbottoms (nb) 14 8 1/2 10 1/2 9 1/2
ABC Stitches (nb) 14 6 1/2 13 9
SnuggleUps (nb) 15 7 14 9
Dappi (small) 15 6 1/2 12 10
Lil Lamonsters (small) 15 6 14 8
Blue Ribbon (nb) 14 4 1/2 13 8
average 14 1/2 6 1/2 12 3/4 9
Small and infant size
Cottonbaby (small) 17 1/2 7 1/2 12 10
Kushie-diaper basics (infant) 18 7 15 1/2 10 1/2
Zippidy (infant) 16 7 1/2 15 10
Indisposables (small) 16 9 15 1/2 11
Indisposables (small) 16 6 14 10 3/4
Mother Ease Sandy (small) 16 1/2 7 15 1/2 10
Kushies Ultra (infant 10-22 lbs) 16 1/2 4 1/2 12 10 1/2
average 16 2/3 7 14 1/5 10 2/5
Medium size
none accumulated yet
Toddler, Large and One Size
Kushie-diaper basics (toddler) 20 7 17 1/2 13
Zippidy (toddler) 20 8 1/2 18 1/2 12
Snap-to-fit (one size) 21 10 17 12 1/2
Snap-to-fit (one size) 19 9 16 11 1/2
Zippidy (XL) 18 7 20 1/2 11 1/2
BabyLove Softwear (one size) 19 1/2 7 1/2 17 1/2 12
Mohter Ease Poplino (one size) 18 8 1/4 19 8 1/2
Mother Ease Sandy (large) 17 9 18 3/4 11
Sandy (large) 16 1/2 8 1/2 19 10 1/2
Kushies Ultra (Toddler 22-35 lbs) 18 4 1/2 14 1/2 13
Kushies Ultra (Toddler older style) 18 5 1/2 14 1/2 13
average 18 2/3 7 5/7 17 1/2 11 2/3

Many thanks to a wonderful lady named Dani who spent a lot of time creating this spreadsheet!!