Baby Clothing Size Guide by Age: What to Buy & When
Share
The Ultimate Baby Clothing Size Guide: How to Find the Perfect Fit
If you’ve ever bought a 0–3 month babygrow only to find it fits for just two weeks, you’re not alone. Baby clothing sizes vary wildly between high-street brands, and every baby grows at their own unique pace.
This practical baby size guide removes the guesswork so you can shop for comfortable, long-lasting organic baby clothes with complete confidence.
How Baby Clothing Sizes Work: Age vs. Weight
Most handmade baby clothes and high-street brands list sizes by age, but weight and length are much more accurate indicators of fit. Use this simple breakdown to find the right size for your growing explorer.
| Size | Average Weight | Best For / Key Features |
| Newborn (0–1 Month) | Up to 10 lbs / 4.5 kg | Hospital bag essentials. Tip: Buy sparingly, as larger newborns skip this size. |
| 0–3 Months | 8–12 lbs / 3.5–5.5 kg | Soft, easy-to-dress styles. Ideal for baby shower gifts and last-minute additions. |
| 3–6 Months | 12–16 lbs / 5.5–7 kg | Active babies. Elastane-blend cotton fabrics prevent baggy knees and retain shape. All of our fabric contains elastane for this very reason. |
| 6–9 Months | 16–20 lbs / 7–9 kg | Weaning & sitting up. Durable and easy to wash organic cotton baby wear. All of our clothing is machine washable and the colours stay true. No fancy detergent needed. |
| 9–12 Months | 20–24 lbs / 9–11 kg | Crawling & pulling up. Non-roll waistbands ensure soft, comfortable fitting leggings & harems. |
| 12–18 Months | 24–28 lbs / 11–13 kg | Early walkers. Full-length or bloomer rompers keep drafts out during active play. |
| 18–24 Months | Toddler (24–28+ lbs) | Potty-training stage. Stretchy leggings, harem pants, shorts, and dresses for easy changes. |
4 Expert Tips for Choosing Handmade Baby Clothes
Size Up When in Doubt: Babies grow rapidly. Choosing one size larger ensures longer wear without sacrificing comfort.
Shop by Weight, Not Just Age: A fast-growing 3-month-old may fit better in 6-month baby clothing. Always check the weight limits first.
Buy One Size Ahead for Gifts: When buying handmade newborn gifts, select the next size up so parents get maximum use out of each item. Our baby clothing starts at 0-3 months for this exact reason.
Invest in Stretchy Organic Cotton: High-quality organic kids' clothing naturally stretches and recovers. Premium natural fibres allow children to get multiple seasons of wear out of a single garment—giving you far better value for money.