Is 4th birthday shirt boy profitable to sell on Amazon United States?

The niche generates $38K/yr across 47 tracked products. 2 of 17 products launched in the last 360 days are still selling. 90-day search growth is -4.6%. Flapen's verdict: Skip it (39/100).

How competitive is the 4th birthday shirt boy niche?

24 brands and 27 sellers compete. The top 5 products take 43% of clicks and top 5 brands hold 69% of demand.

What do buyers complain about in 4th birthday shirt boy?

Top complaints mined from reviews: Size-Overall, Smell, Collar Quality. The return rate is 4.5%.

When does demand for 4th birthday shirt boy peak?

Demand peaks in Sep; the busiest month runs 1.9× the quietest.

What does it cost to enter the 4th birthday shirt boy niche?

Listings span $9.83–$28.52; the average listing price is $14.84 (sweet spot $15–$100). The average incumbent carries 503 reviews — the moat a new listing must climb.

4th birthday shirt boy

Skip it

A small market ($38K/yr) — this niche doesn't clear our bar today.

Review moat

Good503.21

avg incumbent reviews — the moat a new listing must climb

Avg price

Good$14.84

avg listing price — sweet spot $15–$100

Price range

Good$9.83–$28.52

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

Competition

Good43%

top-5 click share — leaders hold, buyers still browse

Brand share

Good69%

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

Returns

Okay4.5%

return rate — above 5% kills the launch gate

Growth

Bad-4.6%

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

Conversion

Bad1.8%

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

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Market size

Bad$38K

$38K/yr · 146K searches

According to Flapen's Amazon United States niche tracking, 4th birthday shirt boy is a $38K/yr Amazon United States market (146K searches/yr). The top 5 brands hold 69% of demand. Demand peaks in Sep. Verdict: Skip it — 39/100.

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

4th birthday shirt boy market data

Units sold / yr: 3K–4K; avg 0–100/product
Revenue / yr: $45K–$59K; units × avg price
Conversion rate: 1.8%
Avg BSR: #381
Page quality: 0%
Prime: 100%
Sponsored: 96%
Out of stock: 2.9%
Avg brand age: 27 months
Avg seller age: 160 days

Competition & brand share

The top 5 products take 43% of clicks — established leaders, but buyers still shop beyond them.

Brands

24 falling

Sellers

Top-5 brand share

69%

Top 20: 97%

Top-5 click share

43%

Top 20: 75%

Open market

27%

Unordinary Toddler48%
Tstars9%
HELLO MEOW5%
GLIGLITTR4%
Tutu and Sian4%
AG AGUU4%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -4.6% search growth over the last 90 days.

Peak months: Sep · busiest ÷ quietest = 1.9×

Open Trend

Top 4th birthday shirt boy search terms

4 year old birthday shirt29K/yr -12.2%1.0% conv.
4th birthday shirt24K/yr +13.4%0.7% conv.
4th birthday boy20K/yr -9.8%0.2% conv.
4 birthday shirt10K/yr +77.3%0.7% conv.
4 year old boy birthday shirt12K/yr +8.1%1.1% conv.
birthday boy 47K/yr -13.6%0.5% conv.
4 year old birthday shirt boy7K/yr -26.3%0.9% conv.
4 year old shirt7K/yr -11.7%1.5% conv.
happy 4th birthday boy8K/yr -34.7%0.5% conv.
birthday shirt 46K/yr -21.4%0.9% conv.

All search terms

Top 4th birthday shirt 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.

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

rawr im 4 Year Old boy Shirt Roar 4th Birthday Shirt boy Four Dinosaur Tshirt (Charcoal Blue 5 Years)

Unordinary Toddler$12.954.8★1,884 rev

Unicorn 4th Birthday Shirts for Toddler Girls Outfit 4 Year Old Fourth Four Shirt (5 Years Mauve)

Unordinary Toddler$12.884.8★1,510 rev

Birthday boy Shirt Toddler Boys Outfit First Happy 12m 2t 3t 4 Year Old 5 Kids 6th Number Printed T-Shirt (US Age 5 Years Charcoal Black - 4th)

Unordinary Toddler$14.534.8★39 rev

Birthday boy Shirt Toddler Construction Shirts Boys 2t 3t 4 Year Old Excavator Theme Party t-Shirt 5 Kids 6th Outdoor Play (US Age 5 Years French Blue - 4th)

Unordinary Toddler$13.024.9★43 rev

Tutu and Sian Unicorn Birthday Outfit for Girls - Shirt Tutu Skirt Dress Birthday Girl Crown Hair Bow & Satin Sash (Unicorn 4Y 4-5 Years)

Tutu and Sian$28.524.8★542 rev

Newest

by launch date

MULOIUDZ Girls Birthday Shirts 4th Four Ever Sweet T-Shirts Crown Donut Birthday Outfit 4 Years Old Tees B-Day Party Tops(Apricot 4th)

MULOIUDZ$14.569 rev

3mo ago

MULOIUDZ Girls Birthday Shirts 4th Four Ever Sweet T-Shirts Crown Donut Birthday Outfit 4 Years Old Tees B-Day Party Tops(Pink 4th)

MULOIUDZ$14.779 rev

3mo ago

Birthday boy Shirt Toddler Construction Shirts Boys 2t 3t 4 Year Old Excavator Theme Party t-Shirt 5 Kids 6th Outdoor Play (US Age 5 Years French Blue - 4th)

Unordinary Toddler$13.0243 rev

4mo ago

Birthday boy Shirt Toddler Boys Outfit First Happy 12m 2t 3t 4 Year Old 5 Kids 6th Number Printed T-Shirt (US Age 5 Years Charcoal Black - 4th)

Unordinary Toddler$14.5339 rev

5mo ago

Viworld Toddler Boy 4th Birthday Outfit 3 Year Old 2-Sided Print Polo and Shorts 2Pcs for Celebration & Photoshoot 4T

Viworld$14.8442 rev

6mo ago

What buyers say about 4th birthday shirt boy

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

What buyers love

Size-Overall28%

“Fits just right”

Quality-Overall20%

“Overall, its a great quality shirt that looks good, feels comfortable, and lasts beyond just the birthday”

Soft Feel8%

“The fabric blend is notably soft and breathable, which kept my little one comfortable all day without any irritation on sensitive skin”

Advertised Vs Actual Product8%

“As expected”

Material Quality5%

“Great material and very soft”

Value For Money4%

“Worth the money”

Print Quality4%

“Print quality was great”

Color4%

“Love the color”

Washability4%

“The quality feels great even after washing it”

Shrinkage Resistance2%

“Great feel did not shrink”

What buyers complain about

Size-Overall42%

“Runs small”

Smell8%

“There is a nasty odor”

Collar Quality7%

“Stains all around the collar”

Product Condition3%

“looked very used”

Shape/Style2%

“A little boxy”

Hard Feel2%

“The shirt is so stiff”

Material Quality2%

“Horrible material and smell”

Advertised Vs Actual Product2%

“the picture is faded”

Value For Money2%

“For the price at the time of ordering of $15 it is a little more than I normally spend on a toddler that constantly makes messes”

Wrinkles1%

“It's wrinkled”

Top return reasons

Size-Overall64%

Length11%

Material Quality4%

Chest Fit3%

Color3%

Advertised Vs Actual Product3%

Sleeve Fit2%

Quality-Overall2%