Girls · Baby (3–12 months)

Between three and twelve months, a baby girl can move through three clothing sizes — which means most of what you buy in this window is really a bet on next month. This collection is organized around that bet. Everything here is sized for the 3–12 month stretch, from soft everyday rompers and one-piece outfits through ruffled and rainbow-print dresses, knit romper sets with matching pants and headbands, denim-look sets, and the occasion pieces this year demands: sequined party dresses, seasonal sets, and first-birthday costume outfits. Every listing carries age-in-months sizing plus an EU height measurement in centimeters, and that second number is the one worth trusting — a long 7-month-old and a petite 10-month-old often wear the same size, and only the centimeters tell you which listing fits. The multi-piece sets earn their place at this stage for a practical reason: they solve the entire outfit, headband included, in one decision — useful in the year when you photograph your child more than any other. Buy slightly ahead, favor pieces that open easily for changes, and this window costs less than it threatens to.

How to choose

• Buy one step ahead: at this growth rate, an outfit that fits perfectly today may last only weeks — sizing slightly up means it fits at its best for longer.
• Count the snaps before the ruffles: this stage still means several diaper changes a day, so outfits that open easily at the bottom or front save real time, every day.
• Match the outfit to the milestone: once babies sit and crawl, dresses ride up during floor play — save them for outings and photos, and let rompers and sets do the crawling shifts.
• Keep the occasion pieces few: one or two dress-up outfits per season is plenty; the everyday rotation of soft sets is what actually gets worn out.

FAQ

What size is a 6-month-old baby girl?

Age labels are only a starting point — babies the same age vary widely in length. Measure your daughter’s height and match it to the EU centimeter range on the listing; if she falls between two sizes, take the larger one.

How many clothes does a baby need from 3 to 12 months?

Because sizes turn over quickly, buy in small batches per size: enough everyday rompers and sets for a week between washes, plus a couple of seasonal layers and one occasion outfit. Restock as she grows rather than stockpiling ahead.

What should a baby girl wear for her first birthday photos?

Sets that include the accessories — a dress or romper with a matching headband — make the photo effortless, and a dedicated first-birthday costume set turns the cake-smash into a finished look without extra shopping.

Before this stage, the newborn girl clothes (0–3 months) collection covers the fourth-trimester wardrobe, and after it, toddler girl clothes (1–3 years) picks up where this one ends. If the sizing between brands leaves you guessing, our guide to what baby clothes sizes really mean explains how to buy by measurement instead.