Size :0-6 months is for baby 0-3 Months(inside length):10.5cm/4.1"inch
Size:7-12 months is for baby 3-6 Months(inside length):11cm/4.3"inch
Size:13-18 months is for baby 6-9 Months(inside length):11.5cm/4.5"inch

Size chart : it  may has 1-2 cm differ due to manual measurement.

Note:The size chart information is only for reference.Please order it with your own needs.

Real color may slightly different from pictures due to computer screen's resolution, brightness, contrast etc. Hope understanding. Have a nice shopping day!