zipper size chart

Size Length (inches) Weight (lbs)
NB 17.5 - 21 6 - 9 lbs
0-3 21 - 24 9 - 12 lbs
3-6 24 - 27 11 - 17 lbs
6-12 27 - 30 16 - 22 lbs
12-18 30 - 32 21 - 25 lbs
18-24 32 - 34 24 - 27 lbs