Size guide

Baby Clothing Size Guide

Age labels are only a starting point. Sizes vary by product and style, so compare the length and chest measurements on the product page with clothes that fit your baby now. All measurements here are approximate and as listed.

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How our sizes work

Each product page lists the garment measurements where we have them. Labels such as “6M” or “73” are not the same on every product, so the measurements matter more than the label. If a measurement you need is missing, email hello@bloomingflowerofficial.com before ordering.

Our size labels at a glance
LabelWhat our listings sayWhere it comes from
NewbornListed as its own size; measurements differ by product. On one romper the Newborn length is not listed.Knit Long-Sleeve Baby Romper
3M, 6M, 9M, 12M, 18M, 24MMonth labels are not the same on every product. Example: 12M is listed as “9–12 months” on the Everyday sweater but “6–12 Months” on the Ruffle Zip Romper.Everyday Ribbed Knit Baby & Toddler Sweater
Ruffle Zip Romper & Bow Headband Set
Month ranges with cm (e.g. “0–3 Months (59 cm)”)The same cm label can carry a different age range: 59 cm is “1–3 Months” on the Cozy Bear Jumpsuit and “0–3 Months” on the Knit Cotton Top & Pants Set.Cozy Bear Cotton Jumpsuit
Knit Cotton Top & Pants Set
Baby 59 / 66 / 73 / 80 / 90Garment labels, not US sizes. On our Mama & Mini knit sweaters the suggested ages are 59 = 0–3 months, 66 = 3–6, 73 = 6–9, 80 = 9–12, 90 = 12–18 months.Mama & Mini Matching Knit Sweater (Sold Separately)
Kids 100 – 140On the same sweaters: 100 = 18–24 months, 110 = 2–3 years, 120 = 3–4, 130 = 4–5, 140 = 5–6 years (suggested ages are a guide).Mama & Mini Matching Knit Sweater (Sold Separately)
3T – 5TEveryday sweater: 3T = 2–3 years, 4T = 3–4, 5T = 4–5 years (suggested ages are a guide).Everyday Ribbed Knit Baby & Toddler Sweater
Child 6T – 12T, Child 2Y – 9YUsed on matching family styles. See product page for the measurements.Ribbed Mama & Mini Sweater Set
Plaid Mama & Mini Shirt Jacket Set
Mom / Adult S – XXLGarment measurements are listed per product (see the Mama & Mini sweater chart below).Mama & Mini Matching Knit Sweater (Sold Separately)

Worked examples

Knit Long-Sleeve Baby Romper

Knit Long-Sleeve Baby Romper: approximate, as listed
SizeLength
3M48 cm (18.9 in)
6M50 cm (19.7 in)
9M52 cm (20.5 in)

Newborn length is not reliably listed. See product page, or email us before choosing Newborn.

Everyday Ribbed Knit Sweater (6M–5T)

Everyday Ribbed Knit Sweater (6M–5T): approximate, as listed
OptionSuggested ageLengthChestSleeve
6M3–6 months31 cm (12.2 in)62 cm (24.4 in)29 cm (11.4 in)
9M6–9 months33 cm (13.0 in)64 cm (25.2 in)30.5 cm (12.0 in)
12M9–12 months35 cm (13.8 in)66 cm (26.0 in)32 cm (12.6 in)
18M12–18 months37 cm (14.6 in)68 cm (26.8 in)34 cm (13.4 in)
24M18–24 months39.5 cm (15.6 in)71 cm (28.0 in)36 cm (14.2 in)
3T2–3 years42 cm (16.5 in)74 cm (29.1 in)38 cm (15.0 in)
4T3–4 years44.5 cm (17.5 in)77 cm (30.3 in)41 cm (16.1 in)
5T4–5 years47 cm (18.5 in)80 cm (31.5 in)44 cm (17.3 in)

Mama & Mini matching sweaters

In the Mama & Mini Matching Sweater Set, pick the adult and the baby or kids size separately. The adult sweater is also sold on its own as the Mama Matching Knit Sweater, and the Mini sweater as the Mini Matching Knit Sweater. The set costs less than buying both.

Baby sizes: approximate, as listed
SizeSuggested ageLengthChest
Baby 590–3 months30 cm (11.8 in)56 cm (22.0 in)
Baby 663–6 months31 cm (12.2 in)62 cm (24.4 in)
Baby 736–9 months33 cm (13.0 in)64 cm (25.2 in)
Baby 809–12 months35 cm (13.8 in)66 cm (26.0 in)
Baby 9012–18 months37 cm (14.6 in)68 cm (26.8 in)
Kids sizes: approximate, as listed
SizeSuggested ageLengthChest
Kids 10018–24 months39.5 cm (15.6 in)71 cm (28.0 in)
Kids 1102–3 years42 cm (16.5 in)74 cm (29.1 in)
Kids 1203–4 years44.5 cm (17.5 in)77 cm (30.3 in)
Kids 1304–5 years47 cm (18.5 in)80 cm (31.5 in)
Kids 1405–6 years49.5 cm (19.5 in)83 cm (32.7 in)
Mom sizes: approximate, as listed
SizeLengthChest
Mom S62 cm (24.4 in)104 cm (40.9 in)
Mom M63 cm (24.8 in)108 cm (42.5 in)
Mom L64 cm (25.2 in)112 cm (44.1 in)
Mom XL65 cm (25.6 in)116 cm (45.7 in)
Mom XXL66 cm (26.0 in)120 cm (47.2 in)

Where to find each product’s sizes

Still unsure?

Email hello@bloomingflowerofficial.com with your baby’s current measurements and the product you’re looking at. Eligible returns can be requested within 30 days of receiving your item; see our refund policy.

FAQ

What's the difference between Newborn and 3M?

It depends on the product. Size labels are not standard across our listings, and on some products a Newborn length is not listed. Always compare the measurements on the product page, and email us before choosing Newborn if a measurement is missing.

Should I size up?

Some of our product pages recommend sizing up if your baby is between sizes. Check the note on each product page.

What do sizes like 66 or 73 mean?

They are garment labels, not US sizes. On our Mama & Mini knit sweaters the suggested ages are 66 = 3–6 months and 73 = 6–9 months, but the same number can carry a different age range on other products, so check each listing.

How do I size a mama & mini matching set?

Choose each size separately: one adult size and one baby or child size. Adult and Mini pieces are also sold on their own, and a set costs less than buying both pieces separately.

How do I measure?

Lay a garment that fits well flat. Measure length from the shoulder to the hem, and the chest across just below the arms. Our charts list chest as the full circumference, and allow about 1–2 cm difference from a hand measurement.

Can I exchange for a different size?

The fastest way is to return the original item and place a new order for the size you want once the return is accepted. Eligible returns can be requested within 30 days of receiving your item; email hello@bloomingflowerofficial.com first.