Birthday shirt
"My son looked so cool in this paired with the checkered flame shorts!"
| 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 |



FAST MAKES ME HAPPY - BLACK
Fast makes THEM happy. Amazing quality makes YOU happy!
The FAST MAKES ME HAPPY tee is pure Little Trouble energy — black and white classic vibes, goes with everything mix and match and details on details on details. Soft, durable, and made for everyday wear.
T-shirts fit oversized in the width and sleeves for that lived in slouch look we love so much.
• Made with our signature, perfectly balanced blend of organic cotton and rayon made from bamboo via closed-loop production
• “FAST MAKES ME HAPPY” graphic on the back
• Woven LT logo patch on the front
• Unisex relaxed fit
T-shirts fit oversized in the width and sleeves for that lived in slouch look we love so much.
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: 4.979592 / 5 from 49 reviews.
The Fast Makes Me Happy T-Shirt Black is praised for its high-quality material and soft texture, making it a durable and comfortable choice for everyday wear. Its classic black and white design offers versatile mix-and-match options, while the oversized fit provides a trendy slouch look.
Review topics: ["quality","material","design","shirt","looks","fit","tee"].
"My son looked so cool in this paired with the checkered flame shorts!"
— Rachel (5/5)
"Love this shirt! I bought my Husband one to match. Love when LT does adult sizes for the kiddos to match Dad or Mom! Super cute! Super soft! Love the rubber logo on the bottom of the shirts that they've added. It's just a logo but it adds so much to the shirt! Can't go wrong with any of their clothing!"
— Jordan A. (5/5)
"The quality is great! Looks cool!"
— Arcel P. (5/5)
"Great!!"
— Colleen B. (5/5)
"Great quality"
— Stephen (5/5)
"These shirts are awesome, great material, wash well don't fade or shrink"
— Brianna (5/5)
"We love this tee of course amazing quality super soft"
— Todd G. (5/5)
"Fits my nephew perfectly, and fast does make him happy"
— Jamilia (4/5)
"We have the orange and had to grab the black one cause we are obsessed with all LT tees!"
— Kenzie (5/5)
"Great quality and so soft! My kids feel so comfortable in this!"
— Hannah T. (5/5)