Bloomies are a light weight cover to go over a fitted nappy or terry towel, they are a waterproof wrap made from PUL with soft elastic waist and legs.
The come in 4 sizes:
Newborn - 6 - 12 lbs
Small - 10 - 16 lbs
Medium - 15 - 25 lbs
Large - 26lbs +
Sizes are approx, depending on shape size of baby