Quick Facts
12 inch Costway kids bike with adjustable seat and dual brakes, recommended for ages 3 to 4.
Best for
Children ages 3 to 4 learning to ride
Key detail
Solid metal frame
Size and fit
12 inch, ages 3-4, weight capacity 145 lbs
Consider if
Consider a larger bike if child taller than 41.3 inches
Shipping
Free US shipping over $100, 30-day returns
Confidence-Building 12 Inch Kids Bike
Dual brakes, adjustable saddle, and training wheels help kids learn to pedal, balance, and stop with growing independence and safety.
Confidence-Building 12 Inch Kids Bike
Learn to Balance
Learn to Balance

Removable training wheels let you start steady and remove support when your child is ready. The bike size and saddle range fit growing 3 to 4 year olds, helping progress from guided rides to confident independent pedaling.

Durable, Kid-Safe Construction
Durable, Kid-Safe Construction

A solid metal frame and enclosed transparent chain cover protect small hands while staying sturdy through everyday use. Reflectors, non-slip pedals, and an ergonomic seat add safety and comfort for short neighborhood rides.

Stable, Confidence-Building Training Wheels
Stable, Confidence-Building Training Wheels

Detachable training wheels offer steady practice and easy removal as balance improves. The bike arrives mostly assembled with tools included, so setup is quick and you can get riding sooner.

Dual Brake System
Hand brake and rear coaster brake give kids two ways to stop safely.
Solid Metal Frame
Strong steel frame stands up to everyday bumps and play.
Quick Seat Adjust
Quick release lever makes seat height changes fast and tool-free.
Ergonomic Ride
Non-slip pedals, a cozy saddle, and smooth tires for comfortable rides.
How to Choose the Right Kids Bike

Pick the right wheel size and features so your child learns safely and enjoys riding.

  1. Measure Inseam: Have your child stand and measure crotch to floor. Compare to the saddle height so feet can touch the ground.
  2. Pick Wheel Size: Wheel sizes usually match age ranges, but inseam is the best fit check. Choose the size where your child can straddle and reach the pedals.
  3. Check Braking: Choose a bike with both a hand brake and coaster brake for easier skill transition and better stopping control.
  4. Think About Terrain: Airlike, enduring tires work well on sidewalks, asphalt, and light trails. Match the wheel type to where you plan to ride most.
  5. Plan for Growth: Adjustable saddle and handlebar heights extend use across seasons, letting one bike fit more than one year.
Frequently Asked Questions
What age is this 12 inch bike for?

This 12 inch model is recommended for ages 3 to 4 years old. Always supervise children during rides and follow the sizing guidance.

What is the weight capacity?

The bike supports up to 145 lbs. Follow the manufacturer guidelines to keep riding safe and stable.

How much assembly is required?

The bike comes 95 percent pre-assembled, and tools are included for final setup. Most families report simple, quick assembly at home.

What surfaces can we ride on?

Enduring tires are suitable for wood floors, sidewalks, brick, asphalt, and cement. Avoid steep hills and very loose gravel for first rides.

What are your shipping and return policies?

We ship from a US warehouse, and orders over $100 ship free within the continental US. We offer 30 day returns and human customer support if you need help.

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"Only paci my breast feed three week old has accepted so far🙌🏼"

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DB
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"LIFE. SAVER. Bought this the first week I started nursing my son and had the WORST cracked nipples. These solved the issues OVERNIGHT!"

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ShanKelly92
Verified buyer · January 27, 2026
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"I was lucky to find this pad for my grandson’s bassinet. I like how it is all natural snd organic. Just make sure to buy it a little bigger because it shrinks after washing. Also give ample time…"

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Lucinda
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★★★★☆

"These helped at first but it seemed like the edges dug into my skin making it irritated (might have needed the larger ones). Once my milk came in more, milk would spill everywhere. I found that milk…"

T
Trish
Verified buyer · May 10, 2025
★★★★★

"Perfect. Great price and my little one very opposed to training has only had accidents in the last week. My daughter is 2yrs old, 27 lbs and the Medium is perfect. She has room in them but the arent…"

E
Elizabeth
Verified buyer · April 2, 2026
★★★★★

"Initially, I was skeptical of using it, but when my doc referred it to me for my cracked nipple, it worked like a charm. I did not want to put any balm or lotion over my nipple as I did not wanted…"

S
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Verified buyer · December 5, 2025
★★★★★

"Amazing tool for breastfeeding! These protect sensitive, chapped or cracked nipples like little shields. No more sticking to clothing/bras and wincing when anything bumps into my chest. I've been…"

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J
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"I cant belive they heal hours within you put them on. Totally a must while breastfeeding. Such a good quality"

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"I used these for the first four weeks after baby came. It was during that phase where baby was so small he didn’t have a great latch and so I was getting sore nipples. This was great for protecting…"

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Jessica
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★★★★★

"Only paci my breast feed three week old has accepted so far🙌🏼"

H
Hannah
Verified buyer · April 6, 2026
★★★★★

"Worked great and would definitely use again. The only thing is sizing can be tricky. I would’ve gotten a size bigger and I’d consider my size to be on the smaller side. If you’re not sure, just size…"

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DB
Verified buyer · November 17, 2025
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"I wore these for the first two months and they truly saved my breastfeeding journey - worked exactly how I expected. They gave instant relief. I basically wore them day and night for the first 6…"

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Giselle
Verified buyer · January 28, 2026
★★★★★

"Love these , I bought due to damage from pumping . One week with creams and balms didn’t do much but two days with these and I’m almost healed !"

A
Amazon
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★★★★★

"LIFE. SAVER. Bought this the first week I started nursing my son and had the WORST cracked nipples. These solved the issues OVERNIGHT!"

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Verified buyer · January 27, 2026
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"Did the job, kept me more comfortable the first couple weeks postpartum as breastfeeding was established. Next time I would go for the design that has perforated holes for airflow."

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GI
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"As a breastfeeding mom I truly couldn’t recommend these more. They literally SAVED MY LIFE in the newborn stage and then saved me again when teething started. They’re easy to use, easy to clean and…"

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"This is a great item to have for breastfeeding mommas. It feels very cooling and refreshing after breastfeeding and makes wearing nursing bras very comfortable since the fabric is not rubbing on your…"

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"These cups protect and help heal sore nipples so quickly. Comfortable under a bra, easy to clean, and worth the investment for breastfeeding. Stats: 5’3”, 140 lbs, 8 weeks postpartum & nursing"

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"These are perfect for breastfeeding. They help keep any ointment or lanolin from getting on your clothes and smooth for immediate relief of cracks or nipple soreness in the first few weeks."

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jake
Verified buyer · March 25, 2026
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"Had a cracked nipple, added some organic ointment and put this over it, healed in 2 days! Recommend it 100%"

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Jasmin
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"These are great for nursing in the first few weeks when there’s soreness and breakdown. Would recommend!"

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Julie
Verified buyer · April 10, 2026
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"These were wonderful for me postpartum while learning to breastfeed. Highly recommend. They are easy to clean & very functional."

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"It saved my nipples multiple times. They’re super light. Quality is good, they do bend for no reason lol overall a good product."

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"These were great in the beginning helped me so much."

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"Any first time mama BUY THIS PRODUCT!!!! I cannot recommend and rave about this enough. They HELPED so so much! I wore them all the time when my nipples felt dry, cracked, and just hurt. Those first…"

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Chaise
Verified buyer · January 4, 2026
★★★★☆

"Did the job, kept me more comfortable the first couple weeks postpartum as breastfeeding was established. Next time I would go for the design that has perforated holes for airflow."

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GI
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★★★★★

"As a breastfeeding mom I truly couldn’t recommend these more. They literally SAVED MY LIFE in the newborn stage and then saved me again when teething started. They’re easy to use, easy to clean and…"

T
Tiffany
Verified buyer · September 2, 2025
★★★★★

"This is a great item to have for breastfeeding mommas. It feels very cooling and refreshing after breastfeeding and makes wearing nursing bras very comfortable since the fabric is not rubbing on your…"

M
Micho
Verified buyer · September 21, 2025
★★★★★

"These cups protect and help heal sore nipples so quickly. Comfortable under a bra, easy to clean, and worth the investment for breastfeeding. Stats: 5’3”, 140 lbs, 8 weeks postpartum & nursing"

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Verified buyer · September 25, 2025
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"Great value for the price compared to name brand silverettes. I only really used them for maybe 2-3 weeks, so I’m glad I didn’t spend the extra money when these got the job done just as well"

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Hailey
Verified buyer · September 7, 2025
★★★★★

"These are perfect for breastfeeding. They help keep any ointment or lanolin from getting on your clothes and smooth for immediate relief of cracks or nipple soreness in the first few weeks."

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jake
Verified buyer · March 25, 2026
★★★★★

"Had a cracked nipple, added some organic ointment and put this over it, healed in 2 days! Recommend it 100%"

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Jasmin
Verified buyer · October 28, 2025
★★★★★

"These are great for nursing in the first few weeks when there’s soreness and breakdown. Would recommend!"

J
Julie
Verified buyer · April 10, 2026
★★★★☆

"These were wonderful for me postpartum while learning to breastfeed. Highly recommend. They are easy to clean & very functional."

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Bridget
Verified buyer · December 10, 2025
★★★★☆

"It saved my nipples multiple times. They’re super light. Quality is good, they do bend for no reason lol overall a good product."

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W
Verified buyer · September 8, 2025
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"These were great in the beginning helped me so much."

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Kyle
Verified buyer · December 11, 2025
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"Any first time mama BUY THIS PRODUCT!!!! I cannot recommend and rave about this enough. They HELPED so so much! I wore them all the time when my nipples felt dry, cracked, and just hurt. Those first…"

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Chaise
Verified buyer · January 4, 2026