---
title: "Baby Undershirts — $68K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/clothing-shoes-jewelry/baby-undershirts"
last_updated: "2026-08-09T12:25:35.489Z"
locale: en
meta:
description: "Niche score 43/100 · $68K/yr market · 300K searches/yr · $17.39 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 43/100 · $68K/yr market · 300K searches/yr · $17.39 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Baby Undershirts — $68K/yr Amazon US Niche (2026) - Flapen"
---
# **baby undershirts**
**Skip it**
Weak search conversion (1.3%) — this niche doesn't clear our bar today.
Market size 17Growth 23Conversion 16Competition 96Returns 70Price range 73Avg price 81Brand share 37Review moat 21Quality gap 16
**Competition**
**Incredible****18%**
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**
**Good****2.2%**
return rate — above 5% kills the launch gate
**Brand share**
**Okay****83%**
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**
**Bad****10,467.58**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Bad****$68K**
$68K/yr · 300K searches
**Conversion**
**Bad****1.3%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Bad****4.7★**
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 ~~](https://flapen.com/research/methodology)
## **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**
**34**
**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.
6K4KPrime Day '25Spike '25 seasonJanFebMarAprMayJunJulAugSepOctNovDecJanFebMarAprMayJun
Peak months: Oct, Nov · busiest ÷ quietest = 1.6×
[**Open Trend **](https://flapen.com/research/us/clothing-shoes-jewelry/baby-undershirts/trend)
## **Top baby undershirts search terms**
- **baby undershirts**50K/yr-26.1%1.1% conv. - **baby shirt**26K/yr+9.8%0.1% conv. - **newborn shirts**16K/yr+8.4%1.5% conv. - **baby shirts 12-18 months**16K/yr+9.4%0.6% conv. - **baby boy shirt**16K/yr+3.0%0.2% conv. - **12 month boy shirts**16K/yr+1.3%1.5% conv. - **baby boy shirts 12-18 months**18K/yr-11.8%0.7% conv. - **baby boys tops**17K/yr-5.2%0.1% conv. - **camisetas para bebe**12K/yr+20.1%0.0% conv. - **baby shirts 0-3 months**13K/yr-6.9%0.8% conv. [**All search terms **](https://flapen.com/research/us/clothing-shoes-jewelry/baby-undershirts/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.
0%2%$1K4%$3K6%$4K8%$5K1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**Gerber Baby 8-Pack Short Sleeve Onesies Bodysuits Solid White 12 Months**Gerber**$16.81**4.8★56,105 rev](https://www.amazon.com/dp/B07GG1P87H) [2**Amazon Essentials Unisex Babies Short Sleeve T-Shirts Pack of 3 Oatmeal Heather/White/Stripe 18 Months**Amazon Essentials**$14.58**4.8★491 rev](https://www.amazon.com/dp/B0DNJSVL29) [3**Gerber Baby 8-Pack Short Sleeve Onesies Bodysuits Solid White 6-9 Months**Gerber**$16.82**4.8★56,105 rev](https://www.amazon.com/dp/B07GG1ZG8W) [4**Gerber Baby 5-Pack Solid Onesies Bodysuits White 3-6 Months**Gerber**$13.07**4.8★58,053 rev](https://www.amazon.com/dp/B007CRR7Z0) [5**Simple Joys by Carters Baby and Toddler Boys 3-Pack Solid Pocket Short-Sleeve Tee Shirts**Simple Joys by Carter's**$14.76**4.8★24,631 rev](https://www.amazon.com/dp/B09M8YGQDM)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Simple Joys by Carters Baby and Toddler Boys 3-Pack Tank Tops**Simple Joys by Carter's**$15.32**10,403 rev2mo ago](https://www.amazon.com/dp/B07ZPQBRDD) [**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**$23.84**108 rev7mo ago](https://www.amazon.com/dp/B0G4517WWT) [**Simple Joys by Carters Baby and Toddler Boys 3-Pack Solid Pocket Short-Sleeve Tee Shirts**Simple Joys by Carter's**$14.76**24,631 rev9mo ago](https://www.amazon.com/dp/B09M8YGQDM) [**Amazon Essentials Baby Boys Baby Boys and Toddler 2-Pack T-Shirts Pale Yellow/Stripe 18 Months**Amazon Essentials**$14.70**223 rev1y ago](https://www.amazon.com/dp/B0DNJFKWFW) [**Amazon Essentials Unisex Babies Relaxed-Fit 100% Cotton Long-Sleeve T-Shirts Pack of 3 Oatmeal Heather/Stripe Newborn**Amazon Essentials**$16.29**309 rev1y ago](https://www.amazon.com/dp/B0DGLMNJG3)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Gerber Baby 6-Pack Long-Sleeve Side-Snap Mitten-Cuff Shirt white Newborn**Gerber**$17.47**4.5★**▲ 61%**](https://www.amazon.com/dp/B07GG949PB) [**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**$23.84**4.8★**▲ 52%**](https://www.amazon.com/dp/B0G4517WWT) [**Amazon Essentials Unisex Babies Short Sleeve T-Shirts Pack of 3 White 6-9 Months**Amazon Essentials**$14.28**4.8★**▲ 49%**](https://www.amazon.com/dp/B0DNJTYLPF) [**The Childrens Place Baby Boys Short Sleeve Graphic T-Shirt Infant-and-Toddler-Shirts Aspen Gold|Carrot Stick|Clear Aqua 4T US**The Children's Place**$13.01**4.8★**▲ 47%**](https://www.amazon.com/dp/B0BRHKGTZB) [**Gerber Baby Girls 15 Piece Onesies Bodysuit Multi Size Pack Shirt White 0-3M 3-6M 6-9M US**Gerber**$35.35**4.8★**▲ 44%**](https://www.amazon.com/dp/B010XJ8KNG)
**~~View all trending →~~**
## **What buyers say about baby undershirts**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**19%
*“The fit is also slightly snug”*
**Quality-Overall**18%
*“well made and of good quality very comfortable for the kids”*
**Soft Feel**12%
*“Soft to touch”*
**Value For Money**8%
*“Good value for money”*
**Material Quality**7%
*“Material is soft, comfortable and value for the money is awesome”*
**Comfort-Overall**6%
*“comfortable”*
**Gifting Purpose**3%
*“Christmas gift”*
**Ease Of Use**3%
*“Easy to use”*
**Color**3%
*“lots of colors”*
**Durability**2%
*“They are very durable”*
### **What buyers complain about **
**Size-Overall**34%
*“Size up”*
**Quality-Overall**7%
*“Poor make”*
**Shrinkage Resistance**7%
*“Bad shrinkage”*
**Value For Money**4%
*“Waste of money”*
**Material Quality**4%
*“the quality if the material is very poor”*
**Product Condition**3%
*“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/Elasticity**2%
*“it does not stretch a lot however”*
**Color**2%
*“i wish there are multiple colors”*
**Ease Of Use**2%
*“Snaps are some of the most difficult Ive used”*
**Durability**2%
*“Wish it wouldve lasted longer”*
### **Top return reasons **
**Size-Overall**68%
**Length**9%
**Value For Money**4%
**Sleeve Fit**3%
**Material Quality**3%
**Advertised Vs Actual Product**3%
**Thin**2%
**Width**1%
**Quality-Overall**1%
**Chest Fit**1%
## **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.
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