For best fit consider age and weight, but also measure length. To do this measure your baby from the shoulder to bottom of their feet. Then to that measurement add approx 4-6 inches and choose the sleep sack size closest to this length. This will allow them lots of room for movement and some growth.

Do not order the sleep sack on the big side so your baby can "grow into it", this could lead to a safety issue if the sack is too big. Our design and fabrics provide ample room for growth.

We can custom make any size sleep sack, if you have requirements that are not met in the chart above just let us know and we can accomodate you
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 Order Age Weight Length
Preemie  N/A  up to 5lbs  18"
X Small  0-2 months  from 6 lbs  20"
Small  0-3 months  from 10 lbs  22"
Medium  4-8 months  from 18 lbs  26"
Large  9-18 months  from 22 lbs  32"
X Large  18-36 months  from 30 lbs  40"
XX Large  36+ months  from 35 lbs  44"
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TOG Rating
A TOG measurement is a British warmth rating, the higher to TOG the warmer the sleep sack

Wee Rascals Sleep Sacks are available in 3 different TOG ratings
Other Considerations

Sleeves - Adding Sleeves will also make sleep sack warmer during cooler seasons. This is an optional features on all sleep sacks.

Clothing under sleep sack - What you put under your baby will affect their overall warmth. For example with in high summer a onesie may be perfect under a bamboo sleep sack and in winter a thicker knit cotton or fleece sleeper.
  Season Recommended Nursery Temp Wee Rascals Sleep sack
TOG 1.0  Spring , Summer, daytime naps    warmer then 20 °C  Designer cotton with bamboo lining
TOG 1.5   Good all year round   18 - 24 °C (64-75  °F) Organic, Bamboo or Designer Cotton
TOG 2.0  Good all year round except
for high summer
 16 - 20 °C (61-70 °F)  Classic Fleece