Can this be used for babies who can’t sit up on their own?

Yes it can :). As long as the baby has head control (which typically happens around 4 months). Steve

My seat just arrived and it’s not in a box. Is that normal?

No. That is not normal. It should definitely come in the box. Please return to Amazon and order another one. Cheers, Steve

Can you buy a replacement tray? I'd like to have 2 trays, one for playtime (with toys with suction cups that remain on the tray) one for feeding.

You may be able to get one directly from the company but as a Mom of 4 I would say save your money and just remove the toys before feeding and replace them after. Most suction cup toys aren’t THAT strong that it’s troublesome to remove and replace them.

What is the minimum weight/length requirement? My son is 8 months but was born 14 weeks early and is still tiny for his adjusted age (5.5 months).

I don’t have the exact info you’re looking for...sorry. The manufacturer indicates this product is appropriate from age 4 months. I think the more important factor is your little guy’s head/neck control, rather than his size. My daughter has used this seat from four months on with no problems. In fact, the bigger the baby, the more likely they’ll be able to lock out their legs and scoot the entire seat (which is what my baby has figured out in the last month).

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Upseat – The Original Ergonomic Baby Floor & Booster Seat with Tray, Developed with Physical Therapists for Upright Posture & Healthy Hip Development, 4–24 Months, Dishwasher-Safe Extra-Large Tray

Product ID: 114843918

Details

Brand
Upseat
Color
Grey
Item Weight
5.4 Pounds
Material
Foam
Product Dimensions
14"D x 16.5"W

🦴Ergonomic posture support

🦵Healthy hip development

🧼Dishwasher-safe tray

$499.43

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Description

🍼 Elevate baby’s comfort and development—because first seats should be legendary!

BUILT TO LAST - Medical-grade foam with a lifetime warranty, plus a dishwasher-safe extra-large tray for easy cleanup.
HIP HEALTHY DESIGN - Supports natural hip development for long-term comfort and mobility.
COMFORT MEETS STYLE - Soft foam cushion wrapped in a sleek, modern design that fits any home aesthetic.
VERSATILE TRAVEL READY - Transforms from floor seat to booster with tray—lightweight and portable for on-the-go families.
THERAPIST APPROVED POSTURE - Developed with physical therapists to ensure your baby sits upright and strong.

The Upseat is an ergonomically designed baby floor and booster seat, developed with physical therapists to promote upright posture and healthy hip development for babies aged 4 to 24 months (up to 30 lbs). Made from soft, durable medical-grade foam, it features a dishwasher-safe extra-large tray and a sleek, modern design. Lightweight and portable, it’s perfect for home or travel, backed by a lifetime warranty on the seat and one year on the tray.

Specifications

ASIN	B07JQXZ2CW
Age Range (Description)	Baby
Age Range Description	Baby
Assembly Required	No
Best Sellers Rank	#1,488 in Baby ( See Top 100 in Baby ) #10 in Hook-on & Booster Seats
Brand	Upseat
Color	Grey
Customer Reviews	4.6 out of 5 stars 7,801 Reviews
Is Portable	Yes
Item Dimensions D x W x H	14"D x 16.5"W x 10"H
Item Weight	5.4 Pounds
Manufacturer	Nuvate Inc. (The Upseat Company)
Material	Foam
Material Type	Foam
Maximum Weight Recommendation	30 Pounds
Model Number	101
Part Number	101
Product Dimensions	14"D x 16.5"W x 10"H
UPC	627987000276
Unit Count	1.0 Count

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