Size Chart
  Size Age Inches
  Newborn birth - 6 wks 0 - 3.87''
  Size 1 6 wks - 3 mo. 3.87'' - 4.25''
  Size 2 3 - 6 mo. 4.25'' - 4.5''
  Size 3 6 - 9 mo. 4.5'' - 4.87''
  Size 4 9 - 12 mo. 4.87'' - 5.25''
  Size 5 12 - 18 mo. 5.25'' - 5.5''
Size chart is a general guide. It may include sizes that are unavailable for this item.