Upseat Boost Toddler Booster Seat
- Weight Capacity: 50 pounds
- Age Range: 18 months to 5 years
- Portable: Yes
- Material: Foam
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A lightweight booster aimed squarely at older toddlers who already sit on their own, worth a look for travel given its compact size and weight.
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ASIN: B08VV7TSY9Model: 400Category: Highchairs
Overview
The Upseat 400 is a portable foam booster built to turn an existing dining chair into a highchair for children from 18 months to 5 years, rated to 50 pounds. At 3.1 pounds and about 13 by 12 by 5 inches, it is sized to pack down for travel rather than stand alone as a highchair frame.
Its stated age range starts later than most highchairs, at 18 months instead of the usual 4 to 6 months, which positions it as a toddler booster rather than an infant seat.
- Age 18 months to 5 years
- Weight capacity 50 pounds
- Foam construction
- Portable at 3.1 pounds
Who it's for
Parents of toddlers between 18 months and 5 years who want a light seat to carry between homes, restaurants or trips. Not suited to families with an infant who is not yet sitting up unassisted, since the stated range starts well past newborn stage.
Pros and cons
- Light at 3.1 pounds, easy to pack for travel
- Compact footprint of roughly 13 by 12 by 5 inches for storage
- 50 pound rating covers the full stated 18 month to 5 year range
- Not intended for infants, since the age range starts at 18 months
Performance notes
Foam construction keeps the seat light at 3.1 pounds while the 50 pound rating comfortably covers the full stated age span. The listing does not detail how the seat straps to a chair, so attachment security is not confirmed here.
Specifications
| Brand | Upseat |
|---|---|
| Model | 400 |
| Dimensions & fit | |
| Weight Capacity | 50 poundshigher than 59% of 47 highchairs |
| Item Weight | 3.1 poundslower than 85% of 118 highchairs |
| Dimensions | 13 × 12 × 5 inches |
| Dimensions | 13"D x 12"W x 5"H |
| Capacity & performance | |
| Age Range | 18 months to 5 years |
| Construction & materials | |
| Material | Foam |
| Other details | |
| Portable | Yes |
Closest rivals on specs
CoComelon Booster Seat with Tray- Item Weight 3.1 vs 3.9 pounds (-21%)
Boon GRUB Adjustable Baby High Chair- Item Weight 3.1 vs 1 pounds (+210%)
Peg Perego Rialto Booster Seat- Item Weight 3.1 vs 6.6 pounds (-53%)
- Weight Capacity 50 vs 45 pounds (+11%)
Frequently asked questions
What age range is the Upseat 400 rated for?
The listing states 18 months to 5 years.
How much weight can it hold?
It is rated to 50 pounds.
Is the Upseat 400 a full highchair frame?
No. It is a foam booster meant to turn an existing dining chair into a highchair, not a standalone frame.