Find Their Perfect Fit
Our pieces are designed with room to grow. Here's how to find the right size for your little one.
Quick Size Finder
How old is the baby? Select an age range to see our recommendation.
Size Chart
Ashmi & Co. sizing with industry-standard weight and height ranges.
| Size | Weight | Height | EU Size | Wears For |
|---|---|---|---|---|
| NB | Up to 8 lbs | Up to 21.5″ | 56 | 0–4 weeks |
| 0–3M | 8–12 lbs | 21–24″ | 56–62 | 4–8 weeks |
| 3–6M | 12–17 lbs | 24–26.5″ | 62–68 | 6–8 weeks |
| 6–9M | 17–21 lbs | 26.5–28.5″ | 68–74 | 8–10 weeks |
| 9–12M | 21–24 lbs | 28.5–30.5″ | 74–80 | 8–10 weeks |
| 12–18M | 24–27 lbs | 30.5–32.5″ | 80–86 | 3–4 months |
| 18–24M | 27–30 lbs | 32.5–35″ | 86–92 | 3–4 months |
These are general guidelines. Individual babies vary. When in doubt, size up.
How Ashmi & Co. Fits
Most Ashmi pieces run true to size. Knit items have a slight natural stretch, making them forgiving if you're between sizes.
One exception: The Chase Sweatshirt Jogger Set runs large. Customers have purchased 6–9M for 12-month-olds and reported a perfect fit. If you're buying the Chase set, size down one.
For all other pieces, the Lizzie bodysuit, Isabella ruffle collar, Camila bodysuit, Winston romper, and our dress styles, true to size is the right starting point.
Buying a Gift? Here's What to Pick.
Skip Newborn and 0–3M. Babies outgrow them in weeks, often before the gift is even unwrapped. Parents end up with a surplus of those sizes while the 6–9M drawer sits empty.
Great for baby showers. Fits around 3–5 months, right when parents start dressing babies in intentional outfits.
The size most parents run low on. Longest wear window (8–10 weeks) at the age when babies are sitting up and being seen.
For slightly older babies. A full season of wear, perfect for milestone moments.
How to Measure Your Baby
Height
Lay your baby flat on their back. Measure from the top of their head to the heel of their foot.
Weight
Use the most recent pediatrician measurement, or weigh yourself holding baby, then subtract your weight.
When in Doubt
Size up. Our generous cut means the next size up works beautifully, and gives them room to grow into it.
Frequently Asked Questions
What size baby clothes should I buy as a gift?
For most gifting situations, 3–6M or 6–9M is the right call. Newborn and 0–3M sizes are outgrown in weeks (often before the gift is even unwrapped), and parents tend to receive a surplus of them. Sizes 3–6M and 6–9M offer a longer wear window and land at an age when parents are more likely to dress babies in intentional outfits.
If you know the baby's due date or birth month, account for the season: a September baby will be in 6–9M clothing through winter, so a cozy or layerable piece in that size is especially thoughtful.
How long does a baby stay in each clothing size?
It varies by baby, but as a general guide: Newborn fits 0–4 weeks; 0–3M fits roughly 4–8 weeks; 3–6M fits about 6–8 weeks; 6–9M fits 8–10 weeks; 9–12M fits 8–10 weeks; 12–18M fits 3–4 months; and 18–24M fits 3–4 months.
Larger sizes have a much longer wear window, which is one reason they make better gifts. A 90th-percentile baby may skip 0–3M entirely.
Is NB or 0–3 months the same as newborn?
No, they are different sizes. NB (Newborn) is designed for babies up to about 8 lbs and 21.5 inches, which typically means the first few weeks of life. 0–3M is the next size up, fitting babies roughly 8–12 lbs and 21–24 inches.
A baby born at average weight (7–8 lbs) will often skip NB entirely or wear it for only a week or two. 0–3M is the more common starting size for most full-term newborns.
Do Ashmi & Co. baby clothes run small or large?
Most Ashmi & Co. pieces run true to size. Knit items have a slight natural stretch that makes them forgiving of in-between sizing.
The one exception: the Chase Sweatshirt Jogger Set runs large. Customers have reported buying 6–9M for a 12-month-old and having it fit perfectly. Always check the individual product page for brand-specific sizing notes.
How many baby clothes do I need per size?
For NB and 0–3M, aim for 5–7 bodysuits, 4–5 pants or rompers, and 2–3 dressier pieces. For 3–6M through 9–12M, you can keep a leaner rotation: 6–8 bodysuits, 4–6 pants or rompers, and 2–4 occasion pieces.
By 12–18M and beyond, babies stay in each size longer, so a slightly larger wardrobe makes sense. Between gifts and hand-me-downs, most parents end up with more than enough of the smaller sizes and wish they had more in 9–12M and up.