Size

Bamboo Baby Clothing & Sleep Bag Size Guide

Bamboo Baby Clothing & Sleep Bag Size Guide

Baby clothing is sized first by weight — not by age — because babies grow at very different rates. Find your child’s current weight on the chart below, then match it to the size row. For sleep bags, you also need the room temperature in mind: pair the weight range with the right TOG rating to keep baby comfortable all night.

Sleep Bags Rompers & Sleepwear Tops Bottoms Toddler & Kids Beanies TOG Guide How to Measure

1. Sleep Bags

Sized by weight, not age. Pair with the TOG rating below.
Size Weight (lbs) Weight (kg) Recommended Age Length (in) Length (cm)
Newborn 5 – 8 2 – 3.6 0 – 3 months 18 46
Small 8 – 13 3.6 – 5.9 3 – 6 months 22 56
Medium 13 – 20 5.9 – 9 6 – 12 months 25 64
Large 20 – 25 9 – 11.3 12 – 18 months 28 71
X-Large 25 – 30+ 11.3 – 13.6+ 18 – 24 months 31 79
If baby is between sizes, size up — a slightly larger bag is safer than one that is too snug around the shoulders and chest.

2. Rompers & One-Piece Sleepwear

Zips and snaps for easy diaper changes.
Size Weight (lbs) Weight (kg) Recommended Age Height (in) Height (cm)
Newborn 5 – 8 2 – 3.6 0 – 1 month 18 – 21 46 – 53
0 – 3M 8 – 12 3.6 – 5.4 0 – 3 months 21 – 23 53 – 58
3 – 6M 12 – 16 5.4 – 7.3 3 – 6 months 23 – 25 58 – 64
6 – 9M 16 – 20 7.3 – 9 6 – 9 months 25 – 27 64 – 69
9 – 12M 20 – 24 9 – 10.9 9 – 12 months 27 – 29 69 – 74
12 – 18M 24 – 28 10.9 – 12.7 12 – 18 months 29 – 31 74 – 79
18 – 24M 28 – 32 12.7 – 14.5 18 – 24 months 31 – 33 79 – 84
Bamboo fabric has natural stretch. If your baby is between sizes, the smaller size will still fit comfortably and last a full season.

3. Tops & Long-Sleeve Onesies

Same weight sizing as rompers. Use for layering.
Size Weight (lbs) Weight (kg) Recommended Age Chest (in) Chest (cm)
Newborn 5 – 8 2 – 3.6 0 – 1 month 14 – 15 36 – 38
0 – 3M 8 – 12 3.6 – 5.4 0 – 3 months 15 – 16 38 – 41
3 – 6M 12 – 16 5.4 – 7.3 3 – 6 months 16 – 17 41 – 43
6 – 9M 16 – 20 7.3 – 9 6 – 9 months 17 – 18 43 – 46
9 – 12M 20 – 24 9 – 10.9 9 – 12 months 18 – 19 46 – 48
12 – 18M 24 – 28 10.9 – 12.7 12 – 18 months 19 – 20 48 – 51
18 – 24M 28 – 32 12.7 – 14.5 18 – 24 months 20 – 21 51 – 53

4. Pants & Leggings

Match by weight. Elastic waistbands have plenty of give.
Size Weight (lbs) Weight (kg) Recommended Age Waist (in) Waist (cm)
Newborn 5 – 8 2 – 3.6 0 – 1 month 13 – 14 33 – 36
0 – 3M 8 – 12 3.6 – 5.4 0 – 3 months 14 – 15 36 – 38
3 – 6M 12 – 16 5.4 – 7.3 3 – 6 months 15 – 16 38 – 41
6 – 9M 16 – 20 7.3 – 9 6 – 9 months 16 – 17 41 – 43
9 – 12M 20 – 24 9 – 10.9 9 – 12 months 17 – 18 43 – 46
12 – 18M 24 – 28 10.9 – 12.7 12 – 18 months 18 – 19 46 – 48
18 – 24M 28 – 32 12.7 – 14.5 18 – 24 months 19 – 20 48 – 51

5. Toddler & Kids' Pajamas

Sizes 2T through 5.
Size Weight (lbs) Weight (kg) Recommended Age Height (in) Height (cm)
2T 28 – 32 12.7 – 14.5 2 years 32 – 34 81 – 86
3T 32 – 36 14.5 – 16.3 3 years 34 – 37 86 – 94
4T 36 – 40 16.3 – 18 4 years 37 – 40 94 – 102
5 40 – 45 18 – 20 5 years 40 – 43 102 – 109

6. Beanies & Headwear

Bamboo knit — stretches to fit.
Size Recommended Age Head Circumference (in) Head Circumference (cm)
Newborn 0 – 3 months 13 – 14 33 – 36
0 – 6M 0 – 6 months 14 – 16 36 – 41
6 – 12M 6 – 12 months 16 – 18 41 – 46
12 – 24M 12 – 24 months 18 – 19.5 46 – 49
2T+ 2 + years 19 – 21 49 – 53
Measure around the forehead, just above the ears and across the widest part at the back of the head.

7. TOG Rating Guide

Pick a TOG to match your nursery temperature.
TOG Weight Room Temp. (°F) Room Temp. (°C) Best For
0.5 Lightweight 74 – 78 23 – 26 Warm summer nights
1.0 Light 69 – 73 21 – 23 Mild weather, spring & early autumn
2.5 Mid-weight 61 – 68 16 – 20 Cool autumn & spring nights
3.5 Plush quilted 54 – 60 12 – 15 Cold winter nights
A higher TOG is not always warmer for baby — choose the lowest TOG that keeps baby comfortable in your nursery. Overheating is a known risk factor for safe sleep.

8. How to Measure Your Baby

Three quick steps for an accurate fit.

1. Weigh Baby

Weigh your baby in pounds or kilograms on a digital scale. Use the most recent weight — size is based on weight, not age.

2. Measure Height

Lay baby flat against a wall or measuring mat. Measure from the top of the head to the heel of the foot with legs stretched out.

3. Match the Charts

Find the row on each chart whose weight and height both fit. If they fall between two sizes, prefer the larger size for sleepwear, the smaller size for clothing.

Sizes are provided as a guide. Babies grow quickly — if you are unsure between two sizes, our support team is glad to help before you order.