Baby Clothes Size Guide

Finding the right newborn clothes size for your little one can be confusing, especially when you’re faced with all those zeros.

In Australia, baby clothing sizes work backwards. The more zeros, the smaller the size. Here’s a quick rundown: 0000 is newborn, 000 is 0–3 months, 00 is 3–6 months, and 0 is 6–12 months.

Our baby onesies follow this sizing system, while our baby beanies and baby turbans are sized by age and head circumference. Check the tables below to find your bub’s best fit.

Not sure which newborn clothes size to choose?

A Guide to the Best Fit

Our baby essentials are designed with comfort in mind, featuring soft, stretchy fabrics with elastane for a snug yet flexible fit. Because of this natural stretch, our sizes are a guide, and fit may vary depending on your baby's individual shape and preference.

Baby Onesies Size Table

Baby Beanies Size Table

Baby Turbans Size Table

How to Choose Your Baby’s Size

When it comes to baby clothes, go by weight first and age second. Babies grow at their own pace, so what fits one three-month-old might be too snug or roomy for another.

Not sure which newborn clothes size to choose? Our sizes are based on average measurements, so checking your baby’s weight against our size chart is a good place to start.

Newborn size (0000) is designed to fit from birth, generally suiting babies up to around 4kg. Bigger bubs might skip straight to size 000 (0-3 months), and that’s perfectly normal.

If your little one falls between sizes, we’d recommend sizing up. Our soft stretch fabric, fold-over cuffs and feet allow for a little growing room, which always comes in handy with babies.

Baby Clothes Size FAQs

What size is 00 in baby clothes?

In Australia, size 00 generally fits babies aged 3-6 months, weighing around 6-8kg. But as any mum will tell you, babies don’t always follow the size chart. Checking their weight is your best bet for finding the right fit.

What size is 0 in baby clothes?

Size 0 is generally for babies aged 6–12 months, weighing around 8–10kg. It’s the largest size in Bowy Made’s onesie range. Once your little one outgrows it, you’ll need to look for the next size up.

What size is 0000 in baby clothes?

Size 0000 is the Australian newborn size, generally fitting babies up to 4kg. It’s where our Bowy Made range begins, with soft, stretchy onesies designed to fit from birth. Just right for those first precious cuddles.

What size is 000 in baby clothes?

Size 000 is usually for babies aged 0–3 months, weighing around 4–6kg. It’s the next step up from newborn (0000), with a little extra room for those growing arms, legs and wriggly toes.

What’s the difference between newborn and 0–3 months?

Newborn (0000) generally fits babies up to 4kg, while 0–3 months (000) suits babies weighing 4–6kg. Size 000 is also a little longer, giving those tiny legs more room to stretch as bub grows.

Is 0–3 months the same as 3 months old?

No, 0–3 months is a clothing size range, not an exact age. Some babies will fit size 000 after just a few weeks, while others might still be wearing it at three months. Babies have their own growing schedules after all.

Will 0–3 month clothes fit a newborn?

Size 000 (0–3 months) might fit a bigger newborn, but it can be quite roomy on smaller babies under 4kg. If you’re preparing for bub’s arrival, having a few pieces in both 0000 and 000 means you’re covered either way.

What size should I buy as a baby shower gift?

When buying baby clothes as a gift, consider the baby’s age and the season they’ll be wearing them. Nobody wants a gorgeous winter outfit that only fits in summer. Our parent study found that wrong sizes and seasons were common gifting regrets!

Ready to Find The Right Fit?

Browse our baby onesies, baby rompers and newborn baby clothes.

Still unsure which size to choose? Reach out to our team, and we’ll be happy to help you find the right fit for your little one.