First Birthday Baby Girl Outfits

Choosing a first birthday outfit should be simple: pick a style that photographs beautifully, feels comfortable for a full day of celebrating, and fits the way your baby will actually spend the party. BloomKnit’s first birthday edit focuses on ivory and white romper dresses with lace, embroidered details and soft special-occasion styling for milestone photos, family gatherings and cake-smash moments.

Last updated October 28, 2026 · BloomKnit

What should a baby girl wear for her first birthday?

For most first birthday celebrations, a romper dress is an easy choice because it gives the dressed-up look of a dress while keeping the practical shape of a romper. Ivory creates a warm, vintage-inspired look, while white feels crisp and classic. Long sleeves work well for cooler celebrations and formal family events; flutter sleeves give a lighter look for indoor parties and warmer days.

BloomKnit first birthday outfit picks

Ivory lace romper with bow collar

The First Birthday Baby Girl Dress, Ivory Lace Romper with Bow Collar is a simple choice when you want an ivory milestone outfit with a statement collar. It is currently offered in baby sizes from 0–6 months through 18–24 months; check the product page for current stock before ordering.

Ivory lace romper with pearl collar

For a more detailed special-occasion look, see the Ivory Lace Baby Romper Dress with Pearl Collar. Its ivory color and lace styling make it especially suited to first birthday portraits, family photographs and ceremony-style celebrations.

White lace romper and bonnet set

If you prefer a traditional white outfit, the White Lace Baby Romper Dress with Matching Bonnet combines a long-sleeve romper dress with a coordinated bonnet. It works well when you want the whole look to feel finished without choosing a separate headpiece.

White flutter-sleeve lace romper

For a lighter silhouette, the White Lace Baby Romper Dress with Flutter Sleeves pairs lace and embroidered details with short flutter sleeves.

Ivory or white for a first birthday?

Both work beautifully. Choose ivory if you like warmer, softer photographs or a vintage-inspired palette. Choose white if the party styling is bright, classic or ceremony-inspired. If you are coordinating siblings or family outfits, use the undertone of the other clothing as your guide: cream and beige pair naturally with ivory, while cool neutrals often pair easily with white. Planning a ceremony-style celebration? See our Baby Girl Christening & Baptism Outfits guide.

Romper dress or traditional dress?

A romper dress is especially practical for babies who will be crawling, being carried, sitting for photographs or moving between activities. A traditional dress can be a lovely option when you want a longer silhouette. For families dressing sisters together, our matching sister outfit guide explains how to coordinate baby romper and girls dress sizes without making the outfits feel overly identical.

How to choose the right size

Use the size and measurement information on the individual product page rather than choosing only by age. Baby sizing can vary between styles. If your child is close to the next size, compare the listed measurements with an outfit that currently fits well. Current availability can also vary by size, so check the selected variant before checkout.

First birthday outfit ideas by celebration

Family party: an ivory lace romper is easy to coordinate with neutral family outfits. Cake smash: choose a romper-style outfit that lets your baby sit and move comfortably. Portrait session: lace, embroidered details and statement collars show clearly in close-up photographs. Formal celebration: a long-sleeve lace style or coordinated bonnet set creates a more traditional finish.

Frequently asked questions

What color is best for a baby girl’s first birthday outfit?

Ivory and white are both versatile because they work with many party themes and photograph well. The better choice is the one that coordinates with your celebration and family outfits.

Can a first birthday outfit also be used for family photos?

Yes. Special-occasion romper dresses are popular for birthday portraits because the lace, collar and embroidered details remain visible in seated and close-up photographs.

Should I size up for a first birthday outfit?

Do not automatically size up. Compare the product-specific measurements with clothing that already fits your child and consider how close the birthday is to the order date.

Is a romper easier than a dress for a one-year-old?

Often, yes. A romper can be easier for crawling, sitting and being carried while still giving a dress-like special-occasion look.

Where can I see more BloomKnit baby outfits?

Browse our bestselling BloomKnit styles, baby and toddler cardigans, and baby shower gift guide for more outfit and gift ideas.

Related first-birthday guides

Choosing the outfit and the gift at the same time? Compare romper vs dress for a baby girl’s first birthday, or see our best gifts for a 1-year-old girl.

Planning a first birthday in 2027?

For a forward-looking checklist, read our Baby Girl First Birthday Outfit Ideas for 2027. If you are choosing the present as well as the outfit, see First Birthday Gifts for Girls in 2027.