One of our favorite shirts !
"We love the quality !"
| Size | 0-6M | 6-12M | 12-18M | 18-24M | 2T | 3T | 4T | 5T | 6T | 7/8 | YS | YM | YL |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Age | 0-6M | 6-12M | 12-18M | 18-24M | 2-3 Years | 3-4 Years | 4-5 Years | 5-6 Years | 6-7 Years | 7-8 Years | 8-10 Years | 10-12 Years | 12-14 Years |
| Height (in) | up to 27 | up to 30 | 30-32 | 32-34 | 33-35 | 36-39 | 39-42 | 42-45 | 45-48 | 48-51 | 51-54 | 54-57 | 57-60 |
| Weight (lb) | up to 16 | up to 20 | 20-24 | 24-28 | 28-32 | 32-37 | 37-43 | 43-49 | 49-56 | 56-66 | 66-76 | 76-86 | 86-100 |
| Size | Baby | Toddler | Youth | Adult |
|---|---|---|---|---|
| Head Circ. | 46-50cm | 50-54cm | 54-58cm | 56-60cm |
| Age Reference | 0-2 Years | 2-5 Years | 5 and up | Adult |



HAPPY OCTANE ONLY GRAPHIC T-SHIRT
Fuel the fun and the happy!
The HAPPY OCTANE ONLY tee brings the smiles with a bold back graphic and a custom LT 110 octane rating (HAPPY OCTANE ONLY)! Made from our signature blend of organic cotton fabric + rayon made from bamboo certified to OEKO-TEX® STANDARD 100 and tested for harmful substances, it’s soft, durable, and made to stay looking fresh no matter how many spins through the wash. You know you're happy if you're pumping 110 😁
• Oeko-Tex® certified organic cotton + rayon made from bamboo blend
• Custom LT “Happy Octane 110” rating logo on front
• Bold back graphic in checkers with our FUN FUEL characters
• Colorful print that won’t fade, crack, or quit
• Unisex relaxed fit
• Runs oversized
Machine wash with other like colors. Hang dry or machine dry on low. Expect 1-2cm of shrinkage on first wash/dry but no shrinkage after that. Sizing is based on age range in the 50th percentile. If between sizes, size up! DO NOT TUMBLE DRY ON HOT/WARM.
Made from 100% Organic Cotton and Bamboo Viscous via closed-loop production!
68% Bamboo Viscous
27% Organic Cotton
5% Spandex


DESIGNED TO BE TOUGH
BY A MOM WITH FAST KIDS

EASY EXCHANGES AND
FAST SHIPPING

FREE SHIPPING ON
U.S. ORDERS OVER $100
Overall rating: 4.977778 / 5 from 45 reviews.
The Happy Octane Only T-Shirt is praised for its fun and unique design, featuring a bold graphic and a custom octane rating. Customers love its softness and oversized fit, making it a fresh and durable addition to their wardrobe.
Review topics: ["design","quality","material","shirt","looks","tee","color","fit","outfit","brothers"].
"We love the quality !"
— Shannon (5/5)
"Soft and thin. Perfect fit around the neck. Perfect length."
— James D. (5/5)
"I got these as a gift for friend’s littles and they LOVED them! Mom said she loved the quality, the boys love the designs, and little sis loves matching and keeping up with big brothers 💕"
— Kortnee S. (5/5)
"These clothes are very durable and are very well made. My grandchildren lol absolutely adorable in them and can hold up to their shenanigans."
— Rebecca P. (5/5)
"Fun shirt and great quality my kids love little trouble clothes and they hold up so well with active kiddos."
— Brianna (5/5)
"Super cute shirt , & it’s a great stretchy material. I’m obsessed!! 😍"
— Sarah A. (5/5)
"My son loves anything with orange or red in it. This tee has been worn many, many times and still looks brand new! The quality of Little Trouble's clothing is amazing! I was worried the graphic's would come off or peel in the wash/dryer and not one has! These clothes stand the test of time with wild toddlers!"
— Jordan A. (5/5)
"Solid quality, super soft, cute design. Love love love"
— SYDNEY (5/5)
"All of these shirts have such great quality! Obsessed"
— SYDNEY (5/5)
"Looks absolutely adorable on my little grandson. He couldn’t wait to wear it and the fit is perfect. Great quality as always!"
— Christy L. (5/5)