baby undershirt
Skip itStrong incumbent ratings (4.8★) — this niche doesn't clear our bar today.
Avg price
Great$18.95avg listing price — sweet spot $15–$100
Price range
Great$8.64–$36.69cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Great39%top-5 click share — an open shelf
Returns
Good2.0%return rate — above 5% kills the launch gate
Brand share
Okay84%top-5 brand share — brands hold most of the demand
Conversion
Okay2.6%search→purchase rate — share of searches ending in a sale
Growth
Bad-5.6%90-day search growth — must beat 0% to launch
Market size
Bad$66K$66K/yr · 133K searches
Quality gap
Bad4.8★avg incumbent rating — lower means beatable quality
Review moat
Bad22,124.85avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, baby undershirt is a $66K/yr Amazon United States market (133K searches/yr). The top 5 brands hold 84% of demand. Demand peaks in Dec. Verdict: Skip it — 42/100.
Data updated Jul 8, 2026 · scored weekly · How we score niches
baby undershirt market data
- Units sold / yr
- 3K–4K
- avg 0–100/product
- Revenue / yr
- $57K–$76K
- units × avg price
- Conversion rate
- 2.6%
- Avg BSR
- #131
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 94%
- Out of stock
- 3.4%
- Avg brand age
- 37 months
- Avg seller age
- 143 days
Competition & brand share
Clicks spread well past the top 5 (39% combined) — an open shelf where new products get seen.Brands
13 falling
Sellers
20
Top-5 brand share
84%
Top 20: 100%
Top-5 click share
39%
Top 20: 70%
Open market
11%
- Gerber57%
- Simple Joys by Carter's9%
- Yoofoss8%
- Amazon Essentials6%
- Onesies Brand5%
- Unnivoll5%
- Open — no brand owns it (7 brands, 11%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -5.6% search growth over the last 90 days.Peak months: Dec · busiest ÷ quietest = 1.4×
Top baby undershirt search terms
- white onesies 3-6 months22K/yr
- baby clothes 3-6 months27K/yr
- 6 month onesies boy16K/yr
- 3-6 month boy onesies12K/yr
- 3 month onesies boys10K/yr
- boys onesies 3-6 months5K/yr
- 3-6 month clothes11K/yr
- 3-6 month baby clothes7K/yr
- onesies 3-6 months boys5K/yr
- carter onesies 3-6 months3K/yr
Top baby undershirt 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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Gerber Baby 5-Pack Solid Onesies Bodysuits White 3-6 Months
Gerber$13.074.8★58,053 rev
Gerber Baby 8-Pack Short Sleeve Onesies Bodysuits Solid White 3-6 Months
Gerber$16.804.8★56,105 rev
Gerber Baby 8-Pack Short Sleeve Onesies Bodysuits Solid White Newborn
Gerber$16.814.8★56,105 rev
Gerber Baby Boys 4 Pack N Play Footie And Toddler Sleepers Jungle Blue 3-6 Months US
Gerber$25.984.7★52,562 rev
Gerber Baby Girls 15 Piece Onesies Bodysuit Multi Size Pack Shirt White 0-3M 3-6M 6-9M US
Gerber$35.354.8★6,640 rev
Newest
by launch date
Simple Joys by Carters Baby Boys 6-Pack Short-Sleeve Bodysuits Bear/Construction/Rhino/Stripe 3-6 Months
Simple Joys by Carter's$19.0066,953 rev
Simple Joys Kids 8 pack short sleeve original bodysuits Shirt White 3-6 Months
Simple Joys by Carter's$15.7022,295 rev
Simple Joys by Carters Unisex Babies 6-Piece Bodysuits (Short and Long Sleeve) and Pants Set Grey/Mint Green/Elephant/Lamb 3-6 Months
Simple Joys by Carter's$23.4128,232 rev
Yoofoss Baby Bodysuits 100% Organic Cotton Baby Short Sleeve Baby Boys Girls Clothes Soft Newborn Infant Romper 5 Pack 3-6 Months
Yoofoss$9.8942 rev
Unnivoll Baby Bodysuits Rayon From Bamboo 3-6 Months Baby Boys Girls Clothes Short Sleeve Infant Newborn Romper 3 Pack Gradient Brown
Unnivoll$17.3632 rev
Trending
90-day click momentumUnnivoll Baby Bodysuits Rayon From Bamboo 3-6 Months Baby Boys Girls Clothes Short Sleeve Infant Newborn Romper 3 Pack Gradient Brown
Unnivoll$17.364.8★
Yoofoss Baby Bodysuits 100% Organic Cotton Baby Short Sleeve Baby Boys Girls Clothes Soft Newborn Infant Romper 5 Pack 3-6 Months
Yoofoss$9.893.9★
Yoofoss Rayon Made From Bamboo Baby Pajamas 3pcs Newborn Sleepers For Boy Girl Clothes 3-6 Months Footed Pajamas Zipper Baby Pjs with Mitten Sage&green&beige
Yoofoss$31.584.6★
Gerber Baby 5-Pack Solid Onesies Bodysuits White 0-3 Months
Gerber$13.064.8★
Gerber Baby Girls 15 Piece Onesies Bodysuit Multi Size Pack Shirt White 0-3M 3-6M 6-9M US
Gerber$35.354.8★
What buyers say about baby undershirt
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent product”
“Material is soft”
“To new great grand child looks like it will fit lookcomfortable”
“Christmas gift”
“Good value for money”
“Comfortable”
“Amazing material”
“All colors are nice”
“Easy to use”
“Instead he feel comfortable warm”
What buyers complain about
“Runs very small”
“Poor sizing and quality”
“Body of the sleeper is a cotton rayon blend”
“Runs small, shrinks”
“Stitching rips”
“has holes after several wears”
“Inferior quality, ugly prints”
“$100 for 5 is out of budget”
“they already have holes”
“After one wash looks really old”
Top return reasons
Common questions
- Is baby undershirt profitable to sell on Amazon United States?
- The niche generates $66K/yr across 48 tracked products. 10 of 14 products launched in the last 360 days are still selling. 90-day search growth is -5.6%. Flapen's verdict: Skip it (42/100).
- How competitive is the baby undershirt niche?
- 13 brands and 20 sellers compete. The top 5 products take 39% of clicks and top 5 brands hold 84% of demand.
- What do buyers complain about in baby undershirt?
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Material Quality. The return rate is 2.0%.
- When does demand for baby undershirt peak?
- Demand peaks in Dec; the busiest month runs 1.4× the quietest.
- What does it cost to enter the baby undershirt niche?
- Listings span $8.64–$36.69; the average listing price is $18.95 (sweet spot $15–$100). The average incumbent carries 22,125 reviews — the moat a new listing must climb.