Would this would be good for a 2nd grader with child size desks at school?

Yes. It is the right size for my (small, but long legged) 9 y.o. (Fourth grader)

I have four of these and one ball has a leak where can I get replacement balls?

They offer replacement balls on Amazon: https://www.amazon.com/gp/product/B073XZPZYC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Can the castor wheels be replaced with the roller blade style wheels that come on some desk chairs now? Is their attachment point the standard size?

I’m not sure what the standard size is but hopefully this helps

Would a 3 year old be able to sit on this chair comfortably?

My son is 47" and it's perfect for him...he's kindergarten. However, you need a very low desk. We have it paired with a lifetime adjustable plastic table on the lowest leg height. It's the rectangle portable table from Costco. I would say it is going to be too small for him in a couple years.

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Classic Balance Ball Chair, Stability Seat

Product ID: 33043777

Details

Brand
Gaiam
Color
Blue/Green
Item Weight
7.6 pounds
Size
Onesize
Style
Kids

🛞Lockable caster wheels for mobility

⚖️38cm child-sized balance ball

🛠️Includes easy-inflation air pump

€ 264.69

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Description

⚡️ Sit Smart, Focus Hard: The Chair That Moves With Your Mind

ALL IN ONE SETUP - Comes complete with pump, adjustable back support, and secure metal frame for instant use.
KID PROVEN DESIGN - Sized perfectly for preschool to 2nd grade, supporting up to 175 lbs with durable materials.
ACTIVE FOCUS BOOSTER - Transforms restless energy into laser-sharp concentration for kids aged 5-7.
MOBILITY MEETS STABILITY - Smooth-rolling, lockable caster wheels let kids move freely without sacrificing balance.
ERGONOMIC POSTURE PERFECTER - Promotes healthy spinal alignment and core engagement during study or play.

The Gaiam Classic Balance Ball Chair is a kid-sized ergonomic seating solution designed to improve posture, focus, and core strength for children aged 5-7. Featuring a 38cm anti-burst balance ball, adjustable back support, lockable caster wheels, and an included air pump, it encourages active sitting to reduce restlessness and enhance concentration in home or classroom settings.

Specifications

Additional Features	Arm Rest, Ergonomic, Rolling
Asin	B01DY5J792
Assembly Instructions Description	Includes: Child-sized 38cm balance ball, easy-inflation air pump, ... INFLATION INSTRUCTIONS: For a perfect fit, it may be necessary to re-inflate the ball once or twice after the initial inflation to stretch to its final size. Inflate ball with air, let stand for 24 hours, deflate 50% then fill again to 38cm height.
Best Sellers Rank	#15,329 in Sports & Outdoors (See Top 100 in Sports & Outdoors) #59 in Exercise Balls
Brand Name	Gaiam
Color	Blue/Green
Customer Reviews	4.2 4.2 out of 5 stars (10,587) 4.2 out of 5 stars
Global Trade Identification Number	00018713622419
Included Components	Gaiam Kids Balance Ball Chair
Item Depth	21 inches
Item Dimensions	34 x 18 x 21 inches
Item Highlight	52cm Anti-Burst Stability Ball \| Core Engagement While Sitting \| Pump Included \| Home & Office Desk Use \| Active Seating
Item Weight	7.6 pounds
Manufacturer	Fit For Life
Manufacturer Part Number	05-62241
Material Type	Metal
Model Number	05-62241
Number Of Items	1
Number Of Packs	1
Product Care Instructions	Wipe with Dry Cloth
Size	Onesize
Style Name	Kids
Unit Count	1 Count
Upc	018713622419

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TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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€ 264.69

Duties & taxes included

In stock

Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Portugal.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

View all Trustpilot reviews