Is baby undershirts profitable to sell on Amazon United States?

The niche generates $68K/yr across 125 tracked products. 13 of 33 products launched in the last 360 days are still selling. 90-day search growth is -4.6%. Flapen's verdict: Skip it (43/100).

How competitive is the baby undershirts niche?

25 brands and 34 sellers compete. The top 5 products take 18% of clicks and top 5 brands hold 83% of demand.

What do buyers complain about in baby undershirts?

Top complaints mined from reviews: Size-Overall, Quality-Overall, Shrinkage Resistance. The return rate is 2.2%.

When does demand for baby undershirts peak?

Demand peaks in Oct–Nov; the busiest month runs 1.6× the quietest.

What does it cost to enter the baby undershirts niche?

Listings span $5.65–$39.86; the average listing price is $17.39 (sweet spot $15–$100). The average incumbent carries 10,468 reviews — the moat a new listing must climb.

baby undershirts

Skip it

Weak search conversion (1.3%) — this niche doesn't clear our bar today.

Competition

Incredible18%

top-5 click share — an open shelf

Avg price

Great$17.39

avg listing price — sweet spot $15–$100

Price range

Good$5.65–$39.86

cheapest to priciest tracked listing — scored on the share inside $15–$100

Returns

Good2.2%

return rate — above 5% kills the launch gate

Brand share

Okay83%

top-5 brand share — brands hold most of the demand

Growth

Bad-4.6%

90-day search growth — must beat 0% to launch

Review moat

Bad10,467.58

avg incumbent reviews — the moat a new listing must climb

Market size

Bad$68K

$68K/yr · 300K searches

Conversion

Bad1.3%

search→purchase rate — share of searches ending in a sale

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

According to Flapen's Amazon United States niche tracking, baby undershirts is a $68K/yr Amazon United States market (300K searches/yr). The top 5 brands hold 83% of demand. Demand peaks in Oct–Nov. Verdict: Skip it — 43/100.

Data updated Jul 8, 2026 · scored weekly · How we score niches

baby undershirts market data

Units sold / yr: 4K–5K; avg 0–100/product
Revenue / yr: $70K–$87K; units × avg price
Conversion rate: 1.3%
Avg BSR: #94
Page quality: 0%
Prime: 100%
Sponsored: 89%
Out of stock: 4.3%
Avg brand age: 37 months
Avg seller age: 147 days

Competition & brand share

Clicks spread well past the top 5 (18% combined) — an open shelf where new products get seen.

Brands

25 rising

Sellers

Top-5 brand share

83%

Top 20: 98%

Top-5 click share

18%

Top 20: 42%

Open market

15%

Gerber35%
Amazon Essentials26%
Simple Joys by Carter's10%
The Children's Place7%
Garanimals3%
Burt's Bees Baby2%
Open — no brand owns it (19 brands, 15%)

Demand & seasonality

Weekly Amazon search volume, last 79 weeks — -4.6% search growth over the last 90 days.

Peak months: Oct, Nov · busiest ÷ quietest = 1.6×

Open Trend

Top baby undershirts search terms

baby undershirts50K/yr -26.1%1.1% conv.
baby shirt26K/yr +9.8%0.1% conv.
newborn shirts16K/yr +8.4%1.5% conv.
baby shirts 12-18 months16K/yr +9.4%0.6% conv.
baby boy shirt16K/yr +3.0%0.2% conv.
12 month boy shirts16K/yr +1.3%1.5% conv.
baby boy shirts 12-18 months18K/yr -11.8%0.7% conv.
baby boys tops17K/yr -5.2%0.1% conv.
camisetas para bebe12K/yr +20.1%0.0% conv.
baby shirts 0-3 months13K/yr -6.9%0.8% conv.

All search terms

Top baby undershirts products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Gerber Baby 8-Pack Short Sleeve Onesies Bodysuits Solid White 12 Months

Gerber$16.814.8★56,105 rev

Amazon Essentials Unisex Babies Short Sleeve T-Shirts Pack of 3 Oatmeal Heather/White/Stripe 18 Months

Amazon Essentials$14.584.8★491 rev

Gerber Baby 8-Pack Short Sleeve Onesies Bodysuits Solid White 6-9 Months

Gerber$16.824.8★56,105 rev

Gerber Baby 5-Pack Solid Onesies Bodysuits White 3-6 Months

Gerber$13.074.8★58,053 rev

Simple Joys by Carters Baby and Toddler Boys 3-Pack Solid Pocket Short-Sleeve Tee Shirts

Simple Joys by Carter's$14.764.8★24,631 rev

Newest

by launch date

Simple Joys by Carters Baby and Toddler Boys 3-Pack Tank Tops

Simple Joys by Carter's$15.3210,403 rev

2mo ago

Garanimals Baby Boy Solid T-Shirt - Short Sleeve Tees - Kids Casual Crew Neck - Size 18 Months - Black Dark Green Dark Beige White - 4 Pack

Garanimals$23.84108 rev

7mo ago

Simple Joys by Carters Baby and Toddler Boys 3-Pack Solid Pocket Short-Sleeve Tee Shirts

Simple Joys by Carter's$14.7624,631 rev

9mo ago

Amazon Essentials Baby Boys Baby Boys and Toddler 2-Pack T-Shirts Pale Yellow/Stripe 18 Months

Amazon Essentials$14.70223 rev

1y ago

Amazon Essentials Unisex Babies Relaxed-Fit 100% Cotton Long-Sleeve T-Shirts Pack of 3 Oatmeal Heather/Stripe Newborn

Amazon Essentials$16.29309 rev

1y ago

What buyers say about baby undershirts

What buyers praise and complain about, mined from review topics.

What buyers love

Size-Overall19%

“The fit is also slightly snug”

Quality-Overall18%

“well made and of good quality very comfortable for the kids”

Soft Feel12%

“Soft to touch”

Value For Money8%

“Good value for money”

Material Quality7%

“Material is soft, comfortable and value for the money is awesome”

Comfort-Overall6%

“comfortable”

Gifting Purpose3%

“Christmas gift”

Ease Of Use3%

“Easy to use”

Color3%

“lots of colors”

Durability2%

“They are very durable”

What buyers complain about

Size-Overall34%

“Size up”

Quality-Overall7%

“Poor make”

Shrinkage Resistance7%

“Bad shrinkage”

Value For Money4%

“Waste of money”

Material Quality4%

“the quality if the material is very poor”

Product Condition3%

“The second bag of Newborn Gerber t-shirts Looked used, possibly washed, all scrambled up in the bag and no tag and most of the t-shirts were unsnapped, not snapped, Did Not Look New, Looked Used”

Stretchability/Expandability/Elasticity2%

“it does not stretch a lot however”

Color2%

“i wish there are multiple colors”

Ease Of Use2%

“Snaps are some of the most difficult Ive used”

Durability2%

“Wish it wouldve lasted longer”

Top return reasons

Size-Overall68%

Length9%

Value For Money4%

Sleeve Fit3%

Material Quality3%

Advertised Vs Actual Product3%

Thin2%

Width1%

Quality-Overall1%

Chest Fit1%

Common questions

Is baby undershirts profitable to sell on Amazon United States?: The niche generates $68K/yr across 125 tracked products. 13 of 33 products launched in the last 360 days are still selling. 90-day search growth is -4.6%. Flapen's verdict: Skip it (43/100).
How competitive is the baby undershirts niche?: 25 brands and 34 sellers compete. The top 5 products take 18% of clicks and top 5 brands hold 83% of demand.
What do buyers complain about in baby undershirts?: Top complaints mined from reviews: Size-Overall, Quality-Overall, Shrinkage Resistance. The return rate is 2.2%.
When does demand for baby undershirts peak?: Demand peaks in Oct–Nov; the busiest month runs 1.6× the quietest.
What does it cost to enter the baby undershirts niche?: Listings span $5.65–$39.86; the average listing price is $17.39 (sweet spot $15–$100). The average incumbent carries 10,468 reviews — the moat a new listing must climb.