| Underthenile Size Chart |
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| Baby Sizes |
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| Age |
Weight (pounds) |
Length (inches) |
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| 0-3 Mos |
8.5 - 12 |
20 - 23.5 |
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| 3-6 Mos |
12.5 - 16 |
24 - 25.5 |
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| 6-9 Mos |
16.5 - 19.5 |
26 - 27.5 |
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| 12-18 Mos |
20.5 - 26 |
28.5 - 32.5 |
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| 3 Mos |
8 - 12.5 |
21.5 - 24 |
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| 6 Mos |
12.5 - 16.5 |
24 - 25.5 |
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| 9 Mos |
16.5 - 20.5 |
26.5 - 28.5 |
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| 12 Mos |
20.5 - 24.5 |
28.5 - 30.5 |
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| 18 Mos |
23.5 - 26 |
31 - 32.5 |
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| 24 Mos |
26.5 - 28 |
33 - 35.5 |
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| Toddler Sizes |
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| 2Y* |
26.5 - 28 |
33 - 35.5 |
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| 4Y |
32.5 - 37 |
38.5 - 41.5 |
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| 6Y |
42.5 - 47 |
45 - 47 |
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| Hat Sizes |
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| Age |
Circumference (inches) |
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| NB - 3 Mos |
12 - 14 |
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| 3 - 6 Mos |
14 - 17 |
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| 6 - 12 Mos |
17 - 19 |
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| 12 - 24 Mos |
19 - 21 |
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* The difference between 24 months and 2Y, is that 24 months has more diaper room.
Long Johns are made to be tight fitting and run small.
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