What Do I Dress My Baby In? Your Friendly Guide to Stress-Free, Sustainable Baby Sizing

Becoming a parent is one of the most beautiful, exhausting, and sometimes downright confusing journeys. If you’re standing in front of a mountain of tiny clothes or have no idea what to buy first, wondering, “What on earth do I dress my baby in and when?” you’re definitely not alone. It’s totally normal to feel overwhelmed, trust me, many have been right where you are.

Babies grow so fast, the seasons change, and suddenly you’re faced with a mountain of baby clothes and way too many questions. But don’t worry, you’ve got this. We’ve put together this simple, season-by-season, month-by-month guide to help you figure out the best sizes and fabrics for your little one, so you can spend less time stressing and more time soaking up those sweet cuddles.

Mini Threads Baby Sizing Chart (with Australian Seasons)

Here’s how sizes generally break down based on your baby’s birth month and the seasons they’ll be wearing them in. This will help you buy or exchange clothes just at the right time:

Birth Month 0–1 Month Size (Weight approx.) 1–3 Months Size (Weight approx.) 3–6 Months Size (Weight approx.) 6–9 Months Size (Weight approx.) 9–12 Months Size (Weight approx.)
January 0000 (3.2–4.5 kg) Jan 000 (4.5–6 kg) Feb–Mar 00 (6–7.5 kg) Apr–Jun 0 (7.5–8.5 kg) Jul–Sep 1 (8.5–9.5 kg) Oct–Dec
February 0000 Feb 000 Mar–Apr 00 May–Jul 0 Jul–Oct 1 Oct–Jan
March 0000 Mar 000 Apr–May 00 Jun–Aug 0 Aug–Oct 1 Oct–Feb
April 0000 Apr 000 May–Jun 00 Jul–Sep 0 Sep–Nov 1 Nov–Mar
May 0000 May 000 Jun–Jul 00 Aug–Oct 0 Oct–Dec 1 Dec–Apr
June 0000 Jun 000 Jul–Aug 00 Sep–Nov 0 Nov–Jan 1 Jan–May
July 0000 Jul 000 Aug–Sep 00 Oct–Dec 0 Dec–Feb 1 Feb–Jun
August 0000 Aug 000 Sep–Oct 00 Nov–Jan 0 Jan–Mar 1 Mar–Jul
September 0000 Sep 000 Oct–Nov 00 Dec–Feb 0 Feb–Apr 1 Apr–Aug
October 0000 Oct 000 Nov–Dec 00 Jan–Mar 0 Mar–May 1 May–Sep
November 0000 Nov 000 Dec–Jan 00 Feb–Apr 0 Apr–Jun 1 Jun–Oct
December 0000 Dec 000 Jan–Feb 00 Mar–May 0 May–Jul 1 Jul–Nov

Dressing Your Baby Through Australian Seasons

☀️ Summer (December to February)

Australian summers can be extremely hot, so dressing your baby in light, breathable fabrics is essential. Natural materials like cotton, muslin, and linen help regulate body temperature and are gentle on sensitive skin.

Instead of short outfits that expose delicate skin, try:

  • Long-sleeved cotton bodysuits for sun protection

  • Muslin pants or lightweight leggings

  • Sleeveless rompers or singlets for extra-hot days

  • Wide-brimmed hats for shade

  • Lightweight sleeping bags for warm nights

Babies can overheat easily, so always prioritise breathable clothing and keep your baby in the shade whenever possible.

🍂 Autumn (March to May)

Autumn brings changeable weather, with warm afternoons and cooler mornings. This is the perfect season for layering so you can easily adjust your baby’s outfit throughout the day.

Consider including:

  • Long-sleeved tops and bodysuits

  • Soft leggings or stretchy pants

  • Cardigans, lightweight knits, or zip-up hoodies

  • Light jackets for cooler mornings

  • Cotton beanies and socks for extra warmth

Layering allows you to use some of your summer staples while adding warmth where needed.

❄️ Winter (June to August)

Winter is all about keeping your baby warm without overheating. Choose breathable, cosy fabrics and layer thoughtfully.

Essential winter items include:

  • Fleece jumpers and pram suits

  • Footed sleepers or layered pyjamas

  • Knitted cardigans and quilted jackets

  • Wool socks, mittens, and warm hats

  • Bodysuits or singlets layered underneath for added warmth

The cold, dry air can be harsh on a baby’s skin, so keep a gentle moisturiser on hand to prevent dryness.

🌸 Spring (September to November)

Spring can be unpredictable. Some days are sunny and warm, while others are breezy and cool. The key to dressing your baby during spring is using light layers that can be easily added or removed.

Recommended spring pieces include:

  • Cotton or bamboo long-sleeved tops and bodysuits

  • Leggings, bloomers, or soft track pants

  • Light cardigans or jackets for cooler mornings

  • Sun hats and soft breathable socks

  • Sleeveless rompers for warmer days

Spring is also a great time to refresh your baby’s wardrobe with seasonal favourites and lighter layers.

Why Mini Threads exists.

Dressing your baby doesn’t have to be stressful. It is completely normal to feel unsure, especially when the seasons change or your little one suddenly outgrows everything. Start with a small collection of essentials like bodysuits, sleepers, tops, pants and hats. Choose breathable fabrics and use layers to keep your baby comfortable in any weather. Most importantly, trust your instincts. If your baby feels too warm or too cold, you can always adjust their outfit.

This guide is here to help, not to overwhelm you. Every baby is different, and you are already doing a great job figuring out what works best for yours.

At Mini Threads, we understand how quickly babies grow and how easy it is to end up with a stack of clothes that no longer fit. Constantly buying new items is not always realistic, either for your budget or for the planet. That is why we created a more sustainable and affordable way to dress your baby. Our bundles and premium item's are filled with preloved, high-quality clothing from brands parents love, thoughtfully selected to suit your baby’s current size and the season ahead.

When your baby outgrows what you have, we make it simple to pass it on. You can donate or exchange clothes for store credit, and we cover return postage for exchanges. It is easy, eco-friendly and helps keep beautiful baby clothes in use longer.

If you’re ready to start exchanging or donating, check out our exchange and donation page and let’s keep those tiny wardrobes flowing. We are here to help keep those tiny wardrobes flowing, without the stress.

 

 


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