Underthenile Size Chart
Baby Sizes
Age Weight (pounds) Length (inches)
0 - 3 Mos 8 - 12 20 - 24
3 - 6 Mos 12 - 16 24 - 26
6 - 9 Mos 16 - 20 26 - 28
12 - 18 Mos 20 - 26 28 - 32
Preemie Up to 5 Lbs Up to 17
Newborn Up to 8 Lbs Up to 20
3 Mos 8 - 12 20 - 24
6 Mos 12 - 16 24 - 26
9 Mos 16 - 20 26 - 28
12 Mos 20 - 24 28 - 30
18 Mos 24 - 26 30 - 32
24* Mos 26 - 28 32 - 36
Toddler Sizes
2Y* 26 - 28 32 - 36
4Y 36 - 40 39 - 42
6Y 45 - 50 45 - 48
Hat Sizes
Age Circumference (inches)
Newborn Up to 12 Inches
NB - 3 Mos 12 - 14 Inches
3 - 6 Mos 14 - 17
6 - 12 Mos 17 - 19
12 - 24 Mos 19 - 21


* The difference between 24 months and 2Y, is that 24 months has more diaper room.

Long Johns are made to be close fitted and run small in order to comply with Federal Safety Standards for children's sleepwear.

Under the Nile DOES NOT use toxic flame retardant chemicals in any of our clothing.

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