12 month onesies boy
Skip itA deep review moat (28,445 avg reviews) — this niche doesn't clear our bar today.
Competition
Great22%top-5 click share — an open shelf
Avg price
Great$19.86avg listing price — sweet spot $15–$100
Price range
Great$9.78–$35.35cheapest to priciest tracked listing — scored on the share inside $15–$100
Returns
Great2.0%return rate — above 5% kills the launch gate
Brand share
Bad90%top-5 brand share — brand-locked demand
Conversion
Bad1.9%search→purchase rate — share of searches ending in a sale
Growth
Bad-11.9%90-day search growth — must beat 0% to launch
Quality gap
Bad4.8★avg incumbent rating — lower means beatable quality
Market size
Bad$57K$57K/yr · 153K searches
Review moat
Bad28,444.84avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, 12 month onesies boy is a $57K/yr Amazon United States market (153K searches/yr). The top 5 brands hold 90% of demand. Demand peaks in Dec. Verdict: Skip it — 42/100.
Data updated Jul 8, 2026 · scored weekly · How we score niches
12 month onesies boy market data
- Units sold / yr
- 3K–4K
- avg 0–100/product
- Revenue / yr
- $60K–$79K
- units × avg price
- Conversion rate
- 1.9%
- Avg BSR
- #126
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 92%
- Out of stock
- 3.3%
- Avg brand age
- 41 months
- Avg seller age
- 159 days
Competition & brand share
Clicks spread well past the top 5 (22% combined) — an open shelf where new products get seen.Brands
13 falling
Sellers
19
Top-5 brand share
90%
Top 20: 100%
Top-5 click share
22%
Top 20: 51%
Open market
6%
- Gerber41%
- Simple Joys by Carter's26%
- Onesies Brand12%
- Amazon Essentials7%
- Yoofoss3%
- Unnivoll3%
- Open — no brand owns it (7 brands, 6%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -11.9% search growth over the last 90 days.Peak months: Dec · busiest ÷ quietest = 1.6×
Top 12 month onesies boy search terms
- onesies 12 months+76K/yr
- onesie 18 months girls11K/yr
- onesies 18 months boy11K/yr
- carters onesies 18 months7K/yr
- 9-12 month boy onesies5K/yr
- onesies 9-12 months boy7K/yr
- onesies 18 months girl5K/yr
- onesies 12 months boy5K/yr
- 18 months onesies boys4K/yr
- 18 months onesies girl4K/yr
Top 12 month 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 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
Gerber Baby 8-Pack Short Sleeve Onesies Bodysuits Solid White 24 Months
Gerber$16.664.8★56,105 rev
Gerber Baby 8-Pack Short Sleeve Onesies Bodysuits Solid White 18 Months
Gerber$16.624.8★56,105 rev
Onesies Brand Baby-Girls 3-Pack Romper Fox 12 Months
Onesies Brand$22.594.8★2,230 rev
Onesies Brand Baby Boys 8-Pack Short Sleeve Mix & Match Bodysuits and Toddler T-Shirt Set Truck 12 Months US
Onesies Brand$24.324.8★13,053 rev
Newest
by launch date
Simple Joys by Carters Baby Girls Short-Sleeve Bodysuit Pack of 6 Multicolor/Ditsy Floral/Floral/Polka Dot/Tropical 24 Months
Simple Joys by Carter's$19.3269,956 rev
Simple Joys by Carters Baby Boys Snug-Fit Footed Cotton Pajamas Pack of 3 Dinosaur/Animal 12 Months
Simple Joys by Carter's$25.8548,657 rev
Simple Joys by Carters Unisex Babies Short-Sleeve Bodysuit Pack of 8 Navy Heather/White/Oatmeal 12 Months
Simple Joys by Carter's$16.3922,295 rev
Simple Joys by Carters Baby Girls 6-Pack Short-Sleeve Bodysuit Multicolor/Dinosaur/Floral/Forest Animals/Fruit/Hearts 12 Months
Simple Joys by Carter's$14.9469,956 rev
Simple Joys by Carters Baby Girls Short-Sleeve Bodysuit Pack of 6 Multicolor/Dinosaur/Floral/Forest Animals/Fruit/Hearts 18 Months
Simple Joys by Carter's$18.0769,956 rev
Trending
90-day click momentum
Yoofoss Baby Bodysuits Rayon Made From Bamboo Soft Baby Short Sleeve Baby Boys Girls Clothes Breathable Newborn Infant Romper 3 Pack 12-18 Months Blue&Gray&Green
Yoofoss$17.544.8★
Unnivoll Baby Bodysuits Rayon From Bamboo 9-12 Months Baby Boys Girls Clothes Short Sleeve Infant Newborn Romper 3 Pack Gradient Blue
Unnivoll$16.364.8★
Unnivoll Baby Bodysuits Rayon From Bamboo 9-12 Months Baby Boys Girls Clothes Short Sleeve Infant Newborn Romper 3 Pack Gradient Brown
Unnivoll$16.094.8★
Gerber Baby Girls 15 Piece Onesies Bodysuit Multi Size Pack Shirt White 0-3M 3-6M 6-9M US
Gerber$35.354.8★
Amazon Essentials Unisex_baby Tight Fit Cotton Footed Pajama (2 Pack) Little Bunnies/Pale Blue 12 Months
Amazon Essentials$16.284.4★
What buyers say about 12 month onesies boy
What buyers praise and complain about, mined from review topics.What buyers love
“Best Quality”
“Fit great”
“The material is soft”
“They are comfortable too”
“comfortable material”
“Good buy for the money”
“As advertised”
“Colors are so cute”
“They keep her warm at”
“Soft and durable”
What buyers complain about
“Sized too small”
“Cheaply made”
“not meant for chunky babies”
“Itchy material thin”
“Misleading and itchy”
“they do shrink”
“Wish they made more colors for a toddler”
“They arent soft”
“The elastic around the ankles is barely there”
“are difficult to put on especially the arms”
Top return reasons
Common questions
- Is 12 month onesies boy profitable to sell on Amazon United States?
- The niche generates $57K/yr across 91 tracked products. 27 of 37 products launched in the last 360 days are still selling. 90-day search growth is -11.9%. Flapen's verdict: Skip it (42/100).
- How competitive is the 12 month onesies boy niche?
- 13 brands and 19 sellers compete. The top 5 products take 22% of clicks and top 5 brands hold 90% of demand.
- What do buyers complain about in 12 month onesies boy?
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Thickness. The return rate is 2.0%.
- When does demand for 12 month onesies boy peak?
- Demand peaks in Dec; the busiest month runs 1.6× the quietest.
- What does it cost to enter the 12 month onesies boy niche?
- Listings span $9.78–$35.35; the average listing price is $19.86 (sweet spot $15–$100). The average incumbent carries 28,445 reviews — the moat a new listing must climb.