From the Babiesfrock studio
Baby dress size chart by age
Measure her body, compare her chest and waist with our size ranges, then check the dress length for the day she’ll wear it.
Choosing her size for a birthday or another occasion? Start with her age on the day, then check the measurements. Our chart covers 0–3 months to 5–6 years. You’ll find the available sizes on each dress page.
Our dress size chart
The chest and waist columns show two lines: “Her body” is the range of her actual body measurements, and “Dress” is the finished dress we send. Measure around her body without adding extra room, then compare both her chest and waist with the body ranges. Sizes can differ between brands, even with the same age on the label. Shoulder and length figures describe the dress itself. The “Below knee” and “Full length” columns show two different dress lengths, so check which length your chosen dress has.
We work out each body range from the dress measurement. Take away 2.5 inches for the smaller number and 2 inches for the larger one. This leaves 2–2.5 inches of room at the chest and waist. For example, a dress chest of 19 inches has a body range of 16.5–17 inches. This room inside the dress is separate from spare fabric at the chest seam.
| Age range | Chest | Waist | Shoulder to shoulder | Shoulder to waist | Below knee | Full length |
|---|---|---|---|---|---|---|
| 0–3 months | Her body 16.5–17Dress 19 | Her body 15.5–16Dress 18 | 7 | 6.5 | 16 | 22 |
| 3–6 months | Her body 17.5–18Dress 20 | Her body 16.5–17Dress 19 | 7.5 | 6.5 | 17 | 23 |
| 6–9 months | Her body 18.5–19Dress 21 | Her body 17.5–18Dress 20 | 8 | 7 | 18 | 24 |
| 9–12 months | Her body 20–20.5Dress 22.5 | Her body 19–19.5Dress 21.5 | 8 | 7.5 | 18 | 24 |
| 12–18 months | Her body 21–21.5Dress 23.5 | Her body 20–20.5Dress 22.5 | 8.5 | 7.5 | 19 | 25 |
| 18–24 months | Her body 21.5–22Dress 24 | Her body 21–21.5Dress 23.5 | 8.5 | 8.5 | 20 | 26 |
| 2–3 years | Her body 22.5–23Dress 25 | Her body 21.5–22Dress 24 | 9 | 9 | 22 | 29 |
| 3–4 years | Her body 23–23.5Dress 25.5 | Her body 22.5–23Dress 25 | 10 | 9.5 | 23 | 31 |
| 4–5 years | Her body 23.5–24Dress 26 | Her body 22.5–23Dress 25 | 10.5 | 9.5 | 25 | 33 |
| 5–6 years | Her body 24–24.5Dress 26.5 | Her body 23–23.5Dress 25.5 | 10.5 | 10 | 27 | 35 |
See the chart in centimetres
This is the same chart in centimetres. One inch is 2.54 centimetres. We round each number to two decimal places at most, the same way as the chart on each dress page.
| Age range | Chest | Waist | Shoulder to shoulder | Shoulder to waist | Below knee | Full length |
|---|---|---|---|---|---|---|
| 0–3 months | Her body 41.91–43.18Dress 48.26 | Her body 39.37–40.64Dress 45.72 | 17.78 | 16.51 | 40.64 | 55.88 |
| 3–6 months | Her body 44.45–45.72Dress 50.8 | Her body 41.91–43.18Dress 48.26 | 19.05 | 16.51 | 43.18 | 58.42 |
| 6–9 months | Her body 46.99–48.26Dress 53.34 | Her body 44.45–45.72Dress 50.8 | 20.32 | 17.78 | 45.72 | 60.96 |
| 9–12 months | Her body 50.8–52.07Dress 57.15 | Her body 48.26–49.53Dress 54.61 | 20.32 | 19.05 | 45.72 | 60.96 |
| 12–18 months | Her body 53.34–54.61Dress 59.69 | Her body 50.8–52.07Dress 57.15 | 21.59 | 19.05 | 48.26 | 63.5 |
| 18–24 months | Her body 54.61–55.88Dress 60.96 | Her body 53.34–54.61Dress 59.69 | 21.59 | 21.59 | 50.8 | 66.04 |
| 2–3 years | Her body 57.15–58.42Dress 63.5 | Her body 54.61–55.88Dress 60.96 | 22.86 | 22.86 | 55.88 | 73.66 |
| 3–4 years | Her body 58.42–59.69Dress 64.77 | Her body 57.15–58.42Dress 63.5 | 25.4 | 24.13 | 58.42 | 78.74 |
| 4–5 years | Her body 59.69–60.96Dress 66.04 | Her body 57.15–58.42Dress 63.5 | 26.67 | 24.13 | 63.5 | 83.82 |
| 5–6 years | Her body 60.96–62.23Dress 67.31 | Her body 58.42–59.69Dress 64.77 | 26.67 | 25.4 | 68.58 | 88.9 |
How to choose her size
- Start with how old she’ll be when she wears the dress.
- Measure around the fullest part of her chest, under her arms, and around her tummy just above her belly button. Enter her exact body measurements without adding extra room. Compare both with the “Her body” ranges in the chart, which allow her to sit and move easily.
- Check the shoulder-to-waist measurement and the length. A below-knee dress will sit differently from a full-length gown.
- If her chest and waist point to different sizes, or either falls outside the ranges, ask our team before ordering. Select “Custom size” on a made-to-order dress page for free custom sizing. Ready-to-ship dresses use their available standard sizes.
For her first birthday: 9–12 or 12–18 months?
Turning one doesn’t automatically mean she needs 12–18 months. For 9–12 months, her body chest range is 20–20.5 inches and waist range is 19–19.5 inches; the dress measures 22.5 inches at the chest and 21.5 inches at the waist. For 12–18 months, her body chest range is 21–21.5 inches and waist range is 20–20.5 inches; the dress measures 23.5 inches at the chest and 22.5 inches at the waist. Check the shoulder and length too. If one size works for her chest but another works for her waist or length, you can choose free custom sizing on a made-to-order dress.
Shop 9–12 months · Shop 12–18 months · Plan her first birthday dress
How free custom sizing works
Choose “Custom size” on the dress page and follow the instructions for measuring her body. You can enter inches or centimetres. Custom sizing is free; the dress is priced at the closest size in our chart. We confirm the custom measurements before we cut her dress.
Made-to-order dresses have 1–1.5 inches of spare fabric at the chest seam for possible alterations. This is extra to the 2–2.5 inches of room we add so she can move comfortably. Enter her body measurements as they are, without adding extra room. One free size alteration is included if you ask within 3 days of delivery. Read the alteration and return terms.
How to measure her
Use a soft measuring tape and follow the numbered drawing below. The guide is the same one shown in “How to measure her” and the custom-size form. Choose the length your dress should have, then measure from the top of her shoulder to that point. Sleeve length is optional; share it when your chosen dress needs a sleeve measurement.
What to measure
- 1Shoulder to shoulderAcross her back, from one shoulder edge to the other.
- 2Chest (around)Around the fullest part of her chest, under her arms.
- 3Waist (around)Around her tummy, just above her belly button.
- 4Shoulder to waistFrom the top of her shoulder straight down to her natural waist.
- 5Shoulder to kneeFor a knee-length dress, from the top of her shoulder to her knee.
- 6Shoulder to below kneeFor a below-knee dress, from the top of her shoulder to just below her knee.
- 7Shoulder to toeFor a full-length dress, from the top of her shoulder to her toes.
- 8Sleeve length (optional)For puffy sleeves, from her shoulder edge to 3/4 arm length.
For full sleeves, from her shoulder edge to her wrist.
Measure her body for a custom size.
Enter her exact measurements without adding extra room.
We make the dress 2–2.5 inches bigger than her body, so she can move in comfort.
We also leave 1–1.5 inches of fabric in the chest seam. It may let the dress be altered later. It is not extra room now.
If you’re unsure how to measure, ask our team.
Shop dresses for her age
- 0–3 months
- 3–6 months
- 6–9 months
- 9–12 months
- 12–18 months
- 18–24 months
- 2–3 years
- 3–4 years
- 4–5 years
- 5–6 years
Still unsure about her size? Read our size and fit answers or ask the Babiesfrock team.