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Wear bright color combinations.
(Image credit: Collage Vintage)

Embrace your inner child and wear whimsical rainbow patterns and bright, bold color combos. Attending a 1-year-old's birthday celebration is the perfect time to break out the Crayola color combos of your childhood dreams.

Shop fun rainbow pieces:

Topshop Glitter Rainbow Pleat Midi Skirt ($65)

Les Petits Joueurs Trilly Rainbow Fur Bag ($860)

No.21 Rainbow Knit Short Sleeve Sweater ($465)

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(Image credit: Collage Vintage)

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Wear Sneakers or Flats
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If you're at all a kid person, you'll probably be running around playing with all the adorable attendees (or they'll be running circles around you). Leave your heels at home and go for cute sneakers or flats. Your feet will thank you.

Shop flat footwear:

Saint Laurent SL/06 Court Classic Leather Sneakers ($595)

Nike Classic Cortez Leather Sneakers ($90)

Stuart Weitzman Pipe Mulearky Flat Embroidered Mules ($425)

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(Image credit: Collage Vintage)

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(Image credit: Collage Vintage)

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Forgo anything too fussy.
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Move about freely in an easy shirtdress or skirt instead of worrying about constantly adjusting or shifting around. With all eyes on the adorable 1-year-old, the pressure's off dress to the nines.

Shop easygoing pieces:

Paloma Wool Maja Dress ($156)

& Other Stories Metal Bar Detail Dress ($85)

Frame Boyfriend Shirt Dress ($165)

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(Image credit: Collage Vintage)

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Opt for high necklines.
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Dressing a touch more conservative than you're used to never hurts. A cute button-down shirt or crewneck sweater looks clean and polished.

Shop high-neckline tops:

Topshop Unique Lambeth Cutout Silk-Jacquard Blouse ($180)

Who What Wear Cozy Striped Crew Sweater ($33)

Farrow Striped Overlap Shirt ($50)

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Avoid wearing white. Try out a fun pattern instead.
(Image credit: Collage Vintage)

Lastly, these are young kids we're talking about at a first birthday, and they're liable to be messy at times. Leave your crisp whites at home because the probability of stains is much higher than at any other occasion.

Shop printed pieces:

Violeta by Mango Floral Print Blouse ($80)

Reformation Carina Dress ($248)

Victoria Beckham Printed Skirt With Cotton and Silk ($1590)

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(Image credit: Collage Vintage)

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(Image credit: Collage Vintage)

Next up, check out the head-to-toe red outfits that'll inspire your holiday looks.

Editor

Anna is an editor on the fashion team at Who What Wear and has been at the company for over five years, having begun her career in the Los Angeles office before relocating to New York, where she's currently based. Having always been passionate about pursuing a career in fashion, she built up her experience interning at the likes of Michael Kors, A.L.C., and College Fashionista before joining the team as a post-graduate assistant editor. Anna has penned a number of interviews with Who What Wear's cover stars over the years, including A-listers Megan Fox, Issa Rae, and Emma Chamberlain. She's earned a reputation for scouting new and emerging brands from across the globe and championing them to our audience of millions. While fashion is her main wheelhouse, Anna led the launch of WWW Travels last year, a new lifestyle vertical that highlights all things travel through a fashion-person lens. She is passionate about shopping vintage, whether it be at a favorite local outpost or an on-the-road discovery, and has amassed a wardrobe full of unique finds. When she's not writing, you can find her shooting street imagery on her film camera, attempting to learn a fourth or fifth language, or planning her next trip across the globe.