What Size Baby Clothes to Buy as a Gift

By Uyo Okebie-Eichelberger, Founder of Ashmi & Co.

I get this question more than any other. A friend is having a baby, or a coworker just announced, or your sister's birthday party for the one-year-old is in two weeks. You want to buy something beautiful. You pull up the site. And then you freeze.

What size do I even get?

I've been on both sides of this. I've been the person staring at a size chart in a store, doing math I wasn't confident about. And I've been the mom opening a gorgeous outfit in newborn size that my daughter wore exactly once before she outgrew it. So here's everything I wish someone had told me before I started buying baby clothes for other people.

Rule #1: Never Buy Newborn Size as a Gift

This is the mistake almost everyone makes the first time. You see "Newborn" on the label and think, the baby is a newborn, so this is the right size. It makes perfect sense. It is also almost always wrong.

Newborn size fits babies up to about 10 pounds. Many babies are born at 7-8 pounds, which means newborn clothes fit for roughly two to four weeks. Some babies are born at 9 or 10 pounds and skip the size entirely. And here's the thing that gets first-time gift buyers: the parents already have newborn clothes covered. Between the hospital, family hand-me-downs, and their own shopping, newborn is the one size nobody needs more of.

I've watched friends open beautiful newborn outfits at baby showers and quietly do the math in their heads, knowing the baby would wear it twice.

The Size Sweet Spots (By Occasion)

Baby shower gift? Go with 3-6 months. The baby isn't here yet, so you're buying ahead. 3-6 months gives the parents something to look forward to, and it lands right in the window where babies are at their most photographed. Everyone else at the shower will bring newborn and 0-3. You'll be the one whose gift actually gets worn for months. The Winston Overalls in 3-6 months have become my default shower gift. $58, premium cotton, and they work for every baby regardless of style.

First birthday? Buy 12-18 months. Not 12 months (they're probably already in that), and not 6-12 months (they're about to outgrow it). 12-18 gives the parents a full season of wear ahead.

Holiday gift for a baby you haven't met yet? Ask the parents what size the baby is wearing right now, then buy one size up. "She's in 6-month clothes" means you buy 6-12 or 9-12.

Due-date gift (baby hasn't arrived)? 0-3 months is safe. It's the first size with real longevity, and the baby will reach it within weeks even if born small.

Quick Reference: Baby Clothing Sizes

Ashmi sizes run true to standard US sizing. No vanity sizing, no brand-specific quirks. If you've bought baby clothes from any major US brand, our sizing will feel familiar.

For detailed measurements by product, see our full size guide.

The Seasonal Trap Nobody Warns You About

This one catches even experienced gift buyers. Say a baby is born in June. You're shopping for the shower, so you buy 3-6 months. Good instinct. But think about when the baby will actually wear that size: September through December. A breezy cotton romper bought in June becomes a fall and winter piece by the time it fits.

The fix is simple. Think about when the baby will wear the size, not when you're buying it.

• Summer baby + 3-6 month gift = they'll wear it in fall/winter. Choose layers, long sleeves, sweaters.
• Winter baby + 3-6 month gift = they'll wear it in spring/summer. Choose rompers, light cotton, short sleeves.
• Not sure? Pick something season-neutral. A cotton set works year-round with the right layering.

This is also why I think sets make such good gifts. Something like the Sammie Set ($36) gives the parent a top and bottom they can mix and layer depending on what season the baby lands in that size. It removes the guessing for you and the styling work for them.

When You Want to Skip the Size Anxiety Entirely

I'll be honest. Some people read all of this, absorb every word, and still feel nervous about picking a size. That's completely reasonable. You're buying clothes for a baby you might not have met, in a body that changes week to week.

Two options that take the pressure off:

Gift sets. A set is already put together as a complete outfit. You pick the size (3-6 months for showers, 6-12 for birthdays), and the rest is handled. Parents love receiving a ready outfit instead of a standalone piece they have to match with something. Browse our gift sets to see what's available.

An eGift card. If you genuinely don't know the baby's size, age, or what the parents already have, an Ashmi eGift card ($50 to $1,000) lets them pick exactly what they need. It's delivered instantly by email, so it works even for last-minute gifts. I know gift cards can feel impersonal, but parents of babies feel differently. They know exactly what size and style they need, and choosing it themselves is sometimes the best gift you can give.

A Few More Things I've Learned

Ask the parents. It feels like it ruins the surprise, but it doesn't. "What size is she wearing now?" is not the same as "What do you want for the shower?" You can still surprise them with the piece itself. Most parents are relieved someone asked about size.

Don't worry about duplicates. Babies go through multiple outfits a day. If two people buy the same romper in the same size, the parents will use both. This is not like buying an adult a duplicate sweater.

Bigger babies exist. If you know the baby is in a higher percentile (the parents will tell you, trust me), go up two sizes from what you'd normally pick. A 90th-percentile three-month-old is already wearing 6-month clothes.

Frequently Asked Questions

eGift cards are delivered instantly by email. Available from $50 to $1,000.