See Why Moms Love IMJ
Birthday Boy Zipper Romper
Rated 5.0 out of 5 stars
816 Reviews
Birthday Boy Zipper Romper
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Birthday Print Collection
Celebrate in style with our Birthday Print Collection! Designed in buttery-soft viscose from bamboo, these pajamas make birthdays extra special with festive prints, colorful details, and cozy comfort for little ones. Available in two playful colorways — blue for boys and pink + purple for girls — so every birthday kid feels celebrated.
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Available in Zipper Rompers + Two-Piece Sets – Perfect for babies, toddlers, and big kids.
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Festive Design – Party hats, balloons, birthday cakes, and confetti make these jammies picture-perfect.
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Soft & Breathable – Our viscose from bamboo fabric keeps kids cool, cozy, and comfy all night (and through the party!).
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Made for Memories – Ideal for cake smash photos, birthday morning surprises, and pajama parties.
Product Details:
- Extremely soft and stretchy
- 95% viscose from bamboo; 5% spandex
- Machine wash cold and tumble dry low
- Double Zipper
- No interior tags
- Footie Flap on all sizes
- Hand Flap on sizes NB - 9-12
- This product is imported
Designed with a snug fit to meet all CPSC safety standards. We never use flame-retardants or harsh chemicals. For your child’s safety, this garment is meant to snug to the body and is not flame resistant.
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Frequently Asked Questions
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It means peace of mind. Every piece of our clothing is certified by STANDARD 100 by OEKO-TEX®, which is a fancy way of saying:
no harmful chemicals, no toxins, nothing icky- just safe, gentle fabric for your little one.
Oeko-Tex testing goes above and beyond national safety standards. From the thread to the dye, everything is screened for over 100 harmful substances. If it touches your baby’s skin, it has to pass the test.
You get softness they love, with the safety you can trust.
Certificate#: BJ050 249975
Test Report#: BJ050 249975.4
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Because softness matters- especially at 2 a.m. Our pajamas are made with viscose from bamboo, a fabric loved for its buttery feel, breathability, and natural stretch. It keeps your little one cool when it’s warm and cozy when it’s chilly, making it just right for sensitive skin (and sleepy snuggles).
Plus, it holds up wash after wash, because we know laundry day is always just around the corner.
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We gladly offer refunds or exchanges within 30 days of delivery on any unworn, unused items with tags still attached.
Just a heads-up: please hold onto the original plastic bag, you’ll need it to send your items back.
Need help with a return? Click HERE to start a return.
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Yes! IMJ fits true to size- no need to size up.
Compared to other viscose-from-bamboo brands, our pajamas are designed with a comfy, flexible fit that grows with your little one (thanks to the natural stretch). If you’re familiar with other bamboo brands, you’ll find our sizing refreshingly consistent- snug, not tight; roomy, not baggy.
When in doubt, check our size chart or reach out- we’re happy to help!
99%would recommend these products
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Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 4 months ago
Customers say these pajamas are incredibly soft and feature adorable prints that they love. The material is stretchy and comfortable, allowing babies to wear them for extended periods as they grow. Many reviews mention the excellent quality and durability, with pajamas holding up well after multiple washes without pilling. Common feedback includes praise for the fast shipping and true-to-size fit, though some note the sizing runs small compared to other brands. A few customers mention the legs can be tight, and one experienced shrinkage issues. Overall, parents are obsessed with the brand and frequently purchase multiple items.
Customers Talked About
- Softness
- Fit
- Design
- Quality
816 reviews
- Kristine M.Verified BuyerReviewingPink Santa Claus Lane Zipper RomperI recommend this productChild's Typical Size 0-3 MonthsSize Purchased 0-3 MonthsRated 5 out of 5 stars6 minutes agoAdorable print!
These pajamas are so soft and the print is really sweet. I ordered the matching bow.
- LindaReviewingShoreline Dreams Zipper RomperI recommend this productRated 5 out of 5 starsYesterday5 Stars
Beautiful print and bamboo is super soft. My grand-daughter will look so sweet and be so comfortable in this romper. Thank you
- Jessica W.Verified BuyerReviewingGreen Nutcracker Zipper RomperI recommend this productRated 5 out of 5 starsYesterdayLove
The best
Pajamas
- Elena P.Verified BuyerReviewingPink Pup Friends Zipper RomperI recommend this productChild's Typical Size 12-18 MonthsSize Purchased 18-24 MonthsRated 5 out of 5 stars3 days agoSo cute
Softest cutest pajamas we have for our girl! True to size, cute pattern and sooo soft/breathable!
- bridget c.Verified BuyerReviewingAirplane Zipper RomperI recommend this productChild's Typical Size 9-12 MonthsSize Purchased 9-12 MonthsRated 5 out of 5 stars4 days agoAmazing
Light stretchy & soo cute
Exclusive Prints
Each season, we release a carefully curated selection of trendy, limited edition prints that can’t be found anywhere else. From playful florals to whimsical winter themes, available only for a short time each season.
Day-To-Night
Our bamboo jammers aren’t just for bedtime! Designed for day-to-night comfort, they’re perfect for lounging at home, nap time, and even play time!
Bamboo Fabric
Made from the softest bamboo fabric, our pajamas are ultra-gentle on delicate skin, offering unmatched comfort for your little ones and you. Experience the luxury of all-day coziness!