18 month long sleeve onesies boy
Skip itA small market ($0/yr) — this niche doesn't clear our bar today.
Price range
Great$13.84–$30.87cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Great$18.05avg listing price — sweet spot $15–$100
Returns
Good2.4%return rate — above 5% kills the launch gate
Competition
Good47%top-5 click share — leaders hold, buyers still browse
Review moat
Bad17,869.47avg incumbent reviews — the moat a new listing must climb
Quality gap
Bad4.8★avg incumbent rating — lower means beatable quality
Market size
Bad$0$0/yr · 14K searches
Growth
Bad-81.4%90-day search growth — must beat 0% to launch
Conversion
Bad0.0%search→purchase rate — share of searches ending in a sale
Brand share
Bad100%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, 18 month long sleeve onesies boy is a $0/yr Amazon United States market (14K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jan–Oct–Nov–Dec. Verdict: Skip it — 27/100.
Data updated Jul 8, 2026 · scored weekly · How we score niches
18 month long sleeve onesies boy market data
- Units sold / yr
- 500–750
- avg 0–100/product
- Revenue / yr
- $9K–$14K
- units × avg price
- Conversion rate
- 0.0%
- Avg BSR
- #85
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 93%
- Out of stock
- 22.3%
- Avg brand age
- 41 months
- Avg seller age
- 192 days
Competition & brand share
The top 5 products take 47% of clicks — established leaders, but buyers still shop beyond them.Brands
5 falling
Sellers
5
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
47%
Top 20: 100%
Open market
0%
- Simple Joys by Carter's53%
- Amazon Essentials21%
- Gerber18%
- Butterblu4%
- Hudson Baby4%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -81.4% search growth over the last 90 days.Peak months: Jan, Oct, Nov, Dec · busiest ÷ quietest = 15.3×
Top 18 month long sleeve onesies boy search terms
- long sleeve onesies 12-18 months1K/yr
- 18 month long sleeve onesies boy7K/yr
- 18 month long sleeve onesies girls6K/yr
Top 18 month long sleeve onesies boy 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 15 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Simple Joys Baby Girls 5 pack long sleeve original bodysuit Shirt Pink/Navy/Mint 18 Months
Simple Joys by Carter's$16.844.8★44,363 rev
Simple Joys by Carters Baby 4-Pack Long-Sleeve Thermal Bodysuits
Simple Joys by Carter's$14.524.9★9,311 rev
Simple Joys by Carters Baby 5-pack Long-sleeved Bodysuits Blue/Grey 24 Months
Simple Joys by Carter's$17.794.8★39,809 rev
Simple Joys by Carters Baby Boys 5-Pack Long-Sleeve Bodysuit Shirt solids 18 Months
Simple Joys by Carter's$17.594.8★39,809 rev
Simple Joys by Carters Baby Girls 5-Pack Long-Sleeve Bodysuit Shirt solid 18 Months
Simple Joys by Carter's$17.134.8★44,363 rev
Newest
by launch dateSimple Joys Baby Girls 5 pack long sleeve original bodysuit Shirt Pink/Navy/Mint 18 Months
Simple Joys by Carter's$16.8444,363 rev
Simple Joys by Carters Baby 4-Pack Long-Sleeve Thermal Bodysuits
Simple Joys by Carter's$14.529,311 rev
Simple Joys by Carters Baby 5-pack Long-sleeved Bodysuits Blue/Grey 24 Months
Simple Joys by Carter's$17.7939,809 rev
Simple Joys by Carters Baby Boys 5-Pack Long-Sleeve Bodysuit Shirt solids 18 Months
Simple Joys by Carter's$17.5939,809 rev
Simple Joys by Carters Baby Girls 5-Pack Long-Sleeve Bodysuit Shirt solid 18 Months
Simple Joys by Carter's$17.1344,363 rev
Trending
90-day click momentum
Amazon Essentials Unisex Babies Long-Sleeve One-Piece Rashguard Bright Mint Green 12 Months
Amazon Essentials$17.124.4★
Amazon Essentials x Sofia Grainge Unisex Babies Long Sleeve Crew Neck Bodysuit Pack of 3 Dark Green/Sheep/Stripe 18 Months
Amazon Essentials$14.844.7★
Butterblu Blake 5-Pack Long Sleeve Bodysuits 100% Organic Cotton Baby Boys & Girls Frost 18 Months
Butterblu$30.874.7★
Hudson Baby Unisex Baby Cotton Long-Sleeve Bodysuits Cars 5-Pack 12-18 Months
Hudson Baby$13.994.8★
Simple Joys by Carters Baby Boys 5-Pack Long-Sleeve Bodysuit Shirt bears/animals green/stripes 18 Months
Simple Joys by Carter's$17.404.8★
What buyers say about 18 month long sleeve onesies boy
What buyers praise and complain about, mined from review topics.What buyers love
“fit incredible”
“Good quality”
“Worth the money”
“Christmas present”
“durable”
“Great price and quality, on the thinner side so good for warmer weather and breathable”
“SO SOFT”
“Definitely breathable”
“Material is soft, comfortable and value for the money is awesome”
“comfortable”
What buyers complain about
“Color change after wash”
“RUNS REALLY SMALL”
“REALLY THIN MATERIAL”
“AFFRAID THEYRE GOING TO RIP IN WASHING MACHINE”
“REALLY THIN MATERIAL”
“the sleeves are already short”
Top return reasons
Common questions
- Is 18 month long sleeve onesies boy profitable to sell on Amazon United States?
- The niche generates $0/yr across 15 tracked products. 6 of 11 products launched in the last 360 days are still selling. 90-day search growth is -81.4%. Flapen's verdict: Skip it (27/100).
- How competitive is the 18 month long sleeve onesies boy niche?
- 5 brands and 5 sellers compete. The top 5 products take 47% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in 18 month long sleeve onesies boy?
- Top complaints mined from reviews: Color, Size-Overall, Thickness. The return rate is 2.4%.
- When does demand for 18 month long sleeve onesies boy peak?
- Demand peaks in Jan–Oct–Nov–Dec; the busiest month runs 15.3× the quietest.
- What does it cost to enter the 18 month long sleeve onesies boy niche?
- Listings span $13.84–$30.87; the average listing price is $18.05 (sweet spot $15–$100). The average incumbent carries 17,869 reviews — the moat a new listing must climb.