First of all, here is an overview of Jelly Alligator's age-based sizing in comparison to the cm sizing that many customers in Europe are used to.
This is a conversion:

CM

Size
56-62 0-3M
68-74 3-6M
80-86 6-12M
92-98 18-24
104-110 2-3Y
116-122 4-5Y
128 6-7Y
134 8-9Y
140-146 10Y
148-152 12Y



Bodysuits (includes all bodies): Width from armpit to armpit.
Length from neck to bottom

Size 

Width 

Length

0-3M

22 cm / 8.7 inch

35,5 cm / 14 inch

3-6M

24,5 cm / 9.7 inch

40 cm / 15.7 inch

6-12M

26 cm / 10.2 inch

43,5 cm / 17.1 inch

18-24M

27 cm / 10.6 inch

47 cm / 18.5 inch

 

Leggings: Width in the waist, length from waist to bottom of the leg

Size 

Width 

Length

0-3M

20,5 cm / 8.1 inch

34 cm / 13.4 inch

3-6M

20,5 cm / 8.1 inch

41 cm / 16.1 inch

6-12M

21 cm / 8.3 inch

48 cm / 18.9 inch

18-24M

21,5 cm / 8.5 inch

55 cm / 21.6 inch

2-3Y

22 cm / 8.7 inch

60 cm / 23.6 inch

4-5Y

23 cm / 9.1 inch

64 cm / 25.2 inch

6-7Y

24 cm / 9.4 inch

70 cm / 27.6 inch

8-9Y

26 cm / 10.2 inch

75 cm / 29.5 inch

10Y

28 cm / 11 inch

80,5 cm / 31.7 inch

 

Short-Sleeve T-shirt (Regular fit): Width from armpit to armpit.

Back: Length from neck to bottom, front: Length from the front (throat) to bottom

Size 

Width 

Back

Front

18-24M

34,5 cm / 13.6 inch

48 cm / 18.9 inch

40,5 cm / 15.9 inch

2-3Y

36 cm / 14.2 inch

52 cm / 20.5 inch

46 cm / 18.1 inch

4-5Y

38,5 cm / 15.2 inch

56 cm / 22 inch

50 cm / 19.7 inch

6-7Y

39 cm / 15.4 inch

58 cm / 22.8 inch

52 cm / 20.5 inch

8-9Y

40 cm / 15.75 inch

60 cm / 23.6 inch

54 cm / 21.3 inch

10Y

42 cm / 16.5 inch

64 cm / 25.2 inch

58 cm / 22.8 inch

12Y

44 cm / 17.3 inch

68 cm / 26.8 inch

62 cm / 24.4 inch



Long Sleeve T-shirt (Oversize fit): Width from armpit to armpit.

Back: Length from neck to bottom, front: Length from the front (throat) to bottom

Size 

Width 

Back

Front

18-24M

39,5 cm / 15.6 inch

42 cm / 16.5 inch

40 cm / 15.7 inch

2-3Y

41 cm / 16.1 inch

46 cm / 18.1 inch

42,5 cm / 16.7 inch

4-5Y

43 cm / 16.9 inch

49 cm / 19.3 inch 

47 cm / 18.5 inch

6-7Y

43,5 cm / 17.1 inch

51 cm / 20.1 inch

49 cm / 19.3 inch

8-9Y

44 cm / 17.3 inch

53 cm / 20.9 inch

51 cm / 20.1 inch

10Y

45 cm / 17.7 inch

57 cm / 22.4 inch

54,5 cm / 21.5 inch

12Y

47 cm / 18.5 inch

61 cm / 24 inch

58 cm / 22.8 inch



Bomber: Width from armpit to armpit, length from neck to bottom

Size 

Width 

Length

18-24M

35 cm / 13.8 inch

39 cm / 15.4 inch

2-3Y

37 cm / 14.6 inch

43 cm / 16.9 inch

4-5Y

39 cm / 15.4 inch

46 cm / 18.1 inch

6-7Y

42 cm / 16.5 inch

49 cm / 19.3 inch

8-9Y

44 cm / 17.3 inch

52 cm / 20.5 inch

10Y

48 cm / 18.9 inch

57 cm / 22.4 inch

12Y

50 cm / 19.7 inch

59 cm / 23.2 inch

 

 

Sweatshirt: Width from armpit to armpit, length from neck to bottom

Size 

Width 

Length

18-24M

33 cm / 13 inch

38 cm / 15 inch

2-3Y

35,5 cm / 14 inch

43,5 cm / 17.1 inch

4-5Y

37,5 cm / 14.8 inch

48 cm / 18.9 inch

6-7Y

40 cm / 15.7 inch

51 cm / 20.1 inch

8-9Y

41 cm / 16 inch

53 cm / 20.9 inch

10Y

42 cm / 16.5 inch

56 cm / 22 inch

12Y

44,5 cm / 17.5 inch

61 cm / 24 inch

 

Dress: Width from armpit to armpit.

Length from neck to bottom, waist measured in front

Size 

Width 

Length

Waist

18-24M

34,5 cm / 13.6 inch

60 cm / 23.6 inch

29 cm / 11.4 inch

2-3Y

36 cm / 14.2 inch

64 cm / 25.2 inch

30 cm / 11.8 inch

4-5Y

37 cm / 14.6 inch

71 cm / 28 inch

31 cm / 12.2 inch

6-7Y

38 cm / 15 inch

74 cm / 29.1 inch

32 cm / 12.6 inch

8-9Y

39 cm / 15.4 inch

79 cm / 31.1 inch

34 cm / 13.4 inch

10Y

41 cm / 16.1 inch

88 cm / 34.6 inch

35 cm / 13.8 inch

12Y

42 cm / 16.5 inch

94 cm / 37 inch

36 cm / 14.2 inch

 

Shorts: Length from waist to lowest point on the leg bottom

Size

Waist

Length

18-24M

23 cm / 9.1 inch

20 cm / 7.9 inch

2-3Y

24 cm / 9.4 inch

21 cm / 8.3 inch

4-5Y

25,5 cm / 10 inch

23 cm / 9.1 inch

6-7Y

27 cm / 10.6 inch

24 cm / 9.4 inch

8-9Y

28 cm /  11 inch

25 cm / 9.8 inch

10Y

29 cm / 11.4 inch

26 cm / 10.2 inch

12Y

29,5 cm / 11.6 inch

27 cm / 10.6 inch