Cloud-soft, breathable, and gentle on sensitive skin — our flat seamed briefs are made from 100% organic cotton ribbed cotton. Provide a higher waist fit and more modest coverage around the bottom, the waist band is covered and wide enough to comfortably sit on the skin without any digging in. General guidance from our reviewers is to size down if between sizes.
FEATURES
Flat seams. Hypoallergenic and made from 100% organic cotton. Dyed with GOTS-certified, water-based dyes—free from AZO toxins.
CLOTHING CARE
Machine wash cold. Tumble dry low.
SHIPPING AND DELIVERY
Shipping & Fulfillment Options: Please select your preferred shipping method at checkout. Standard rates apply for domestic and international orders.
For In Stock Items Only (Same-Day Shipping): If order is placed before 1PM EST we endeavor to ship the same day.
Free Manhattan Pick-Up: Available from our Upper West Side location. For in-stock orders placed before 1PM EST - select at checkout; we'll email to arrange pickup.
This size chart is a starting point, and every child fits a little differently. For more help with measurements and finding the best underwear size, please visit our Size Guide
Age
Size
Head Measurement (inches)
2Y-3Y
S
20.5
3Y-4Y
4Y-5Y
M
22
5Y-6Y
6Y-7Y
7Y-8Y
L
23.5
8Y-9Y
9Y-10Y
This size chart is a starting point, and every child fits a little differently. For more help with measurements and finding the best underwear size, please visit our Size Guide
Size
Height (Inches)
Weight (lbs)
Newborn
17.5 - 20
5.5 - 8
0-3 months
21 - 24.5
8.5 - 14.5
3-6 months
25 - 27
15 - 18
6-12 months
27.5 - 30
18.5 - 21
12-18 months
31 - 33
21.5 - 24
18-24 months
33 - 35
24.5 - 27
This size chart is a starting point, and every child fits a little differently. For more help with measurements and finding the best underwear size, please visit our Size Guide
Size
Height (inches)
Chest (inches)
Waist (inches)
Hip (inches)
2-3 years
35–39.5
20.75
21.25
21.5
3-4 years
40–42
22
22
23
4-5 years
43–45
23
22.5
24
6 years
45.5–49
24
23
25
7 years
50–51
25
23.5
26.5
8 years
52–54
26
24.5
27.5
9 years
54.5–56
27
25–25.5
28.5
This size chart is a starting point, and every child fits a little differently. For more help with measurements and finding the best underwear size, please visit our Size Guide
US Shoe Size
Typical Age Range
Category
0-2
0-6 months
Baby
3-4.5
6-12 months
Baby/ Early Walker
5-7.5
1-2 years
Baby/ Early Walker
8-9.5
2-4 years
Toddler
10-12.5
4-7 years
Toddler/ Little Kid
13-3
7-10 years
Big Kid
This size chart is a starting point, and every child fits a little differently. For more help with measurements and finding the best underwear size, please visit our Size Guide
BRALETTE
Kids Size
7–8 yrs
9–10 yrs
11–12 yrs
1/2 Chest
30
32
34
1/2 Bottom Opening
28
30
32
Front Length
14
15.5
17
Back Length
11
12.5
14
Total Strap Length
20
20.5
21
Distance Between Back Straps
11
11.5
12
BRIEF
Kids Size
7–8 yrs
9–10 yrs
11–12 yrs
Waistband (stretched)
25.26
27.26
29.26
1/2 Hip
30
32
34
Front Rise
13.5
14.5
15.5
Back Rise
15
16
17
Side Length
9
9.5
10.5
Leg Opening
39.33
41.02
41.83
This size chart is a starting point, and every child fits a little differently. For more help with measurements and finding the best underwear size, please visit our Size Guide
Kids Size
Height (in)
Weight (lbs)
Waist (in)
2–3 yrs
33-36
15.7-18.1
15.7-18.1
3–4 yrs
36–39
31–36
16.5-18.9
4–5 yrs
39-42
36–41
17.3-19.7
6
42–45
41–47
18.1-20.5
7
45–48
47–53
18.9-21.3
8
48–51
53–59
19.7-22.1
9
51–54
59–65
20.5-22.9
10
54–57
65–71
21.3-23.7
11
57–60
71–77
22.1-24.5
12
60–63
77–83
22.9-25.3
13
63–66
83–89
23.7-26.1
14
66–69
89–95
24.5-26.9
This size chart is a starting point, and every child fits a little differently. For more help with measurements and finding the best underwear size, please visit our Size Guide
What Makes Treehouse Different
At Treehouse, we’re not raising the standard, we’re rewriting it.
GOTS Certified Organic Cotton
Fair-labor audited
Flat seams
Tagless design
Nickel-free snaps
Compostable packaging
OTHERS
Synthetic blends
No audit
Scratchy seams
Irritating tags
Standard metal snaps
Plastic packaging
5 stars: 9 (82%)
4 stars: 1 (9%)
3 stars: 0 (0%)
2 stars: 1 (9%)
1 star: 0 (0%)
A
Anonymous
I bought these for my granddaughter! So cute and comfy! Can’t be all plastic free wardrobe but trying where it matters most.
So happy you like these!
S
Stephanie Yeager
Not long after my 8 yo grandgirl put on a pair of these for the first time, she said, "I can already feel myself calming down." She and her two younger sisters love the softness and fit of these briefs -- as well as the designs and colors. Thank you, Anastasia, for working So Hard to create a stellar company and products!
Thank you so much for your kind words. They put such a big smile on my face today. Exactly why I do this.
A
Anonymous
My granddaughters absolutely love the underwear!
So happy to hear this Michelle! Makes my day as a founder!
A
A
Amazing quality
Incredible quality, love the prints and the sweet thank you note. I will be buying more in the future!
thank you for your kind words! So glad you love the quality! We are about to release some new styles, prints and bigger sizing range so stay tuned!
P
Pauline A.
amazing quality and so cute
They are so soft - the band is very comfortable. Thanks for making great clothes for our kids
Thank you for your kind words.We are so happy that these are comfortable for your kiddo.
A
Andrea M.
Cute and nice material but
Cute and nice material but the underwear don’t fully cover her bum like all other underwear so she keeps fidgeting with them saying they’re uncomfortable. It’s almost like they’re cheeky cut instead of full which they should be for a toddler.
Thank you so much for sharing this and I’m really sorry they didn’t feel comfortable for her. Fit is everything at this age, and we completely understand your concern around coverage. We’re actively developing new fits this season, including a fuller-coverage hipster style. If you’re open to it, please reach out to us, we’d love to make this right for you.
I
Indira K.
the quality is unmatched
All of my grandchildren are wearing these now. I do not want polyester or other synthetic mixes on them. These fit perfectly and they love them. Also much better price than other brands but honestly better quality.
T
Tasmin
Size down
One star off cos they're oversized by one size and my daughter loved the print and wanted to wear straight away but needs to grow in to them. Otherwise they seem very soft and qhigh quality.
Thank you for noting the sizing. We have added this as guidance to the description! Would love to hear what your little one thinks once she has grown in to them!
D
Dana
the flatseams make a difference
wish these came in more colors as my daughter loves. Please make boxer brief next.
Thank you for the feedback, noted on the more colors and new style!
K
Katya
Perfect :ok_hand:
Sooo soft and beautiful! We love it so much.
S
Sarai
Girls 5 Pack Briefs and Tank 2 Pack
I purchased the Girls Briefs 5 pack and Tank 2 pack for my daughters and couldn’t be more pleased. Upon opening I immediately noticed the silky soft touch of the organic cotton which I have not found in any of the most known brands today for children’s organic cotton clothing. The soft hue prints and colors tones are inviting and make getting dressed fun! The pattern cut of the briefs provides appropriate coverage. All the items run true to size with allowing room to grow. The flat seams are perfected and make the clothing sensory friendly. No more complaints from my children mentioning that the items are “too tight” or “too itchy” but now instead I am hearing “these are the comfiest undies!” and “These tank tops are so soft, Mama!” Also, a huge win when speaking of how the items washed as they kept their shape and softness! If you haven’t found the essentials that truly work for your child then I highly recommend trying Treehouse! We couldn’t be more thankful for their GOTS certified organic collections so carefully thought out and ethically crafted!
Cost per wear
Slow fashion isn’t just KINDER to THE PLANET: it’s KINDER ON your wallet, too!
Check out the cost breakdown of what you’ll pay for this item every time your child wears it. We did the math for you (USD).
Calculating the true cost of your purchase in order to become a more conscious consumer and avoid overspending.
ONCE A MONTH
$3.33
01case
ONCE A WEEK
USD
02case
EVERYDAY
$0.77
03case
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WHERE I CAME FROM
Product’s journey
STEPS AND PROCESSES
Raw materials processing
Refining and supplying material.
Yarn processing
Spinning raw material into yarn.
Fabric processing
Processing and turning yarn into fabric.
Manufacturing
The different manufacturing steps and processes.
Tree House
Design and sale of the product.
WE CARE ABOUT PEOPLE
Fair Working Conditions
Good management practices are implemented to ensure and continuously improve the working conditions of factory workers and all employees.
Certificates
IN NATURE WE TRUST
Sustainable Materials
100% of the materials used in this product are certified with the body below.
Certificates
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