Boon SOAK 3-Stage Bath Tub review

The Boon SOAK is the low-cost pick for parents who want a tub rather than a sink insert. It covers three stages, newborn, growing baby and toddler, using an adjustable support bump instead of a fabric sling, so there is nothing to launder. A contoured back wall lined with non-slip foam holds the baby in place, and Boon says the tub fits in most double sinks, which keeps bath time at counter height without a stand. The drain plug changes color to help you judge the water temperature, a feature that otherwise only the much pricier Stokke Flexi Bath has on this list. Boon rates the SOAK from 0 to 18 months, and the care instructions ask you to drain it fully and store it dry. The limits are documentation and lifespan: the page lists no weight limit or dimensions, and 18 months is shorter than the two years or more promised by Primo and Ingenuity.

Who it is for

parents on a budget who bathe in the kitchen sink

Price

$29.99 on booninc.com; free shipping on orders over $50 in the contiguous US.

3-STAGE BATH TUB $29.99
Quoted from the vendor pricing page on November 13, 2026.

Key features

• Three stages: newborn, growing baby and toddler
• Adjustable support bump to position growing babies
• Contoured back wall with non-slip foam
• Fits in most double sinks
• Color-changing drain plug helps gauge bath temperature

Strengths and weaknesses

• Strength: Tied for the lowest price on the list at $29.99
• Strength: No fabric sling to wash or dry
• Strength: Temperature-sensing drain plug at the lowest price we found
• Weakness: Rated for 0 to 18 months, shorter than the Primo EuroBath's 24+ months
• Weakness: Boon publishes no weight limit or dimensions on the product page
• Weakness: Materials list includes PVC, which some parents avoid

Key facts

• Price: $29.99
• Age range: 0 to 18 months
• Stages: Newborn, growing baby, toddler
• Fits: Most double sinks
• Materials: Polypropylene, PVC, XPE, EVA

Where it ranks

Boon SOAK 3-Stage Bath Tub is No. 3 in our Best Baby Bath Tubs verdict.