What makes this diaper so great? An all snap system in a 3 piece diaper! One size….from birth until potty training! You will find on your one size diaper a total of 4 snaps on the front. This will give you a total of 4 different sizes for your diaper. This will allow the diaper to fit most babies from about 8 lbs- 35 lbs. An investment that will save you money throughout your diapering time!