Free Baby Clothes Sizing Tool
Baby Clothes
Size Chart & Calculator
Find your baby’s clothing size by weight, length, and age. Compare US sizing charts and understand European sizes such as 70, 80, and 90.
This tool uses published clothing measurements. Results are estimates for everyday clothing, not snug-fitting sleepwear.
Baby clothes sizes usually start with Preemie and Newborn (NB), followed by 0–3M, 3–6M, 6–9M, 12M, 18M, and 24M. These labels indicate approximate ages, but the right fit depends on your baby’s weight, body length, and brand.
For example, one brand’s newborn clothes may fit babies weighing 5–8 pounds, while another uses 6–9 pounds. European baby clothes use numeric labels such as 70 and 80, which generally refer to body height in centimeters.
Careonova | Free Size Finder
Baby Clothes Size Calculator
Compare your baby’s measurements with published everyday-clothing size charts. Enter age, weight, or body length to begin.
View Manufacturer Reference Charts
These are body measurement ranges for everyday baby clothing. Always check the size guide for the specific product.
Gerber Baby Clothing
| Size | Weight (lb) | Length (in) |
|---|---|---|
| Preemie | Up to 5 | Up to 17 |
| NB | 5–8 | 17–21 |
| 0–3M | 8–12 | 21–24 |
| 3–6M | 12–16 | 24–26 |
| 6–9M | 16–20 | 26–28 |
| 12M | 20–24 | 28–30 |
| 18M | 24–28 | 30–32 |
| 24M/2T | 28–32 | 32–34 |
Carter’s Bodysuits
| Size | Weight (lb) | Length (in) |
|---|---|---|
| UP5LB | Up to 5 | Up to 17 |
| PRE | Up to 6 | Up to 18 |
| NB | 6–9 | 18–21.5 |
| 3M | 9–12.5 | 21.5–24 |
| 6M | 12.5–17 | 24–27 |
| 9M | 17–21 | 27–28.5 |
| 12M | 21–25 | 28.5–30 |
| 18M | 25–28 | 30–32 |
| 24M | 28–30 | 32–34 |
Sources: Gerber Childrenswear’s Preemie to Toddler chart and Carter’s bodysuit size chart. These are not universal sizing standards or sleepwear size charts.
Baby Clothes Size Chart by Age, Weight, and Height
The following baby clothes size chart covers premature babies through 24 months. It uses Gerber Childrenswear’s published weight and length ranges as a reference.
| Baby Clothes Size | Weight (lb) | Weight (kg) | Length (in) | Length (cm) |
|---|---|---|---|---|
| Preemie | Up to 5 | Up to 2.3 | Up to 17 | Up to 43.2 |
| Newborn (NB) | 5–8 | 2.3–3.6 | 17–21 | 43.2–53.3 |
| 0–3 months | 8–12 | 3.6–5.4 | 21–24 | 53.3–61 |
| 3–6 months | 12–16 | 5.4–7.3 | 24–26 | 61–66 |
| 6–9 months | 16–20 | 7.3–9.1 | 26–28 | 66–71.1 |
| 12 months | 20–24 | 9.1–10.9 | 28–30 | 71.1–76.2 |
| 18 months | 24–28 | 10.9–12.7 | 30–32 | 76.2–81.3 |
| 24M / 2T | 28–32 | 12.7–14.5 | 32–34 | 81.3–86.4 |
Source: Gerber Childrenswear’s published Preemie to Toddler size chart. Measurements are approximate and brand-specific.
A six-month-old baby might fit 3–6M clothing from one brand and 6–9M from another. Age is a helpful starting point, but current weight and length provide a more useful comparison.
Also check the garment type. Bodysuits, pants, jackets, and snug-fitting pajamas may follow different measurements, even within the same brand.
What Do Baby Clothes Sizes 50, 60, 70, 80, 90, and 100 Mean?
Numeric baby clothing sizes generally refer to body height in centimeters. For example, size 80 is associated with a height of approximately 80 cm, or 31.5 inches.
These numbers do not guarantee that every baby of that exact height will fit the garment. Manufacturers may use the number as the upper end or reference point of a height range.
Baby Clothes Numeric Size Conversion Chart
| Numeric Size | Height Reference (cm) | Approx. Inches |
|---|---|---|
| 50 | 50 | 19.7 |
| 56 | 56 | 22.0 |
| 60 | 60 | 23.6 |
| 62 | 62 | 24.4 |
| 68 | 68 | 26.8 |
| 70 | 70 | 27.6 |
| 74 | 74 | 29.1 |
| 80 | 80 | 31.5 |
| 86 | 86 | 33.9 |
| 90 | 90 | 35.4 |
| 92 | 92 | 36.2 |
| 98 | 98 | 38.6 |
| 100 | 100 | 39.4 |
Numeric height references are not universal garment dimensions or exact US age-size equivalents.
Common European sizes include 50, 56, 62, 68, 74, 80, 86, and 92. Some retailers use intermediate labels such as 60, 70, and 90.
For example, H&M associates size 74 with approximately 6–9 months and size 80 with 9–12 months. UNIQLO uses size 70 for approximately 6–12 months and size 80 for 12–18 months.
Numeric sizes should always be checked against the brand’s own recommended measurements.
What Size Is 70 in Baby Clothes?
Size 70 generally refers to baby clothing for a height around 70 cm (27.6 inches).
UNIQLO labels size 70 for approximately 6–12 months. Other brands may use nearby sizes such as 68 or 74 instead.
If your baby is around 27–28 inches long, check the manufacturer’s recommended height range and the garment’s fit before choosing size 70.
What Size Is 80 in Baby Clothes?
Size 80 corresponds to a nominal height of approximately 80 cm (31.5 inches).
Its age equivalent varies by brand. H&M associates European size 80 with approximately 9–12 months, while UNIQLO uses size 80 for 12–18 months.
Your baby’s current measurements are more useful than assuming size 80 always means 12 months.
What Size Is 90 in Baby Clothes?
Size 90 refers to an approximate body height of 90 cm (35.4 inches).
UNIQLO commonly labels this size for 18–24 months. Other brands may use size 92 for a similar stage of growth.
At this point, clothing often begins transitioning toward toddler proportions. Check the waist, seat, and leg length, especially if your child still wears diapers.
Newborn vs. 0–3 Months: What’s the Difference?
Newborn clothes are generally smaller than 0–3 month clothes, but measurement ranges vary between manufacturers.
Carter’s lists its newborn bodysuit size for approximately 6–9 pounds and 18–21.5 inches. Its 3M size covers 9–12.5 pounds and 21.5–24 inches.
Gerber uses slightly different ranges.
| Size | Carter’s Weight | Gerber Weight |
|---|---|---|
| Newborn | 6–9 lb | 5–8 lb |
| 0–3M / 3M | 9–12.5 lb | 8–12 lb |
Sources: Carter’s bodysuit size chart and Gerber Childrenswear’s Preemie to Toddler chart.
Carter’s commonly uses 3M for its first three-month size range, while Gerber uses 0–3M.
A baby weighing 8.5 pounds may fall within Carter’s newborn weight range but Gerber’s 0–3M range. Length and garment fit can help narrow down the choice.
How Long Do Babies Wear Newborn Clothes?
There is no fixed number of weeks.
Some babies outgrow newborn clothes quickly, while smaller babies may wear them longer. Others may need 0–3M clothing from birth.
If you are shopping before delivery, consider buying a limited number of newborn outfits alongside several 0–3M options. This gives you flexibility without relying on a predicted birth size.
Check the fit regularly as your baby grows.
Baby Clothes Sizes by Weight
Weight-based sizing is useful when your baby’s age does not match the typical clothing label.
Gerber’s 0–3M range covers 8–12 pounds, while its 3–6M range covers 12–16 pounds. The 6–9M range covers 16–20 pounds, and its 12M size covers 20–24 pounds.
These are brand-specific ranges, so another manufacturer may recommend a different label for the same weight.
Consider a baby weighing 14 pounds and measuring 25 inches.
Those measurements fit Gerber’s 3–6M range. They also fit Carter’s 6M range. The labels differ, but both match the manufacturers’ published measurements.
What If Weight and Length Suggest Different Sizes?
A baby may fall within one size by weight and another by length.
For example, a baby weighing 8.5 pounds and measuring 22 inches falls within Carter’s newborn weight range, but the length matches its 3M range.
Compare both sizes rather than averaging the measurements.
A longer baby may need extra torso or leg length, while a baby with a broader build may need more room around the chest, waist, or diaper area.
Check whether the garment fits comfortably without pulling at the seams or leaving excessive loose fabric.
How to Measure Your Baby for Clothes
You need two main measurements to choose an infant clothing size: weight and body length.
1. Measure Your Baby’s Weight
Use a suitable baby scale or a recent measurement from your pediatrician’s office.
Record the weight in pounds or kilograms. To convert kilograms to pounds, multiply by approximately 2.205.
For example, 6 kg equals about 13.2 pounds. Use a recent measurement whenever possible.
2. Measure Your Baby’s Length
Babies who cannot stand independently should be measured lying down.
Use a suitable infant measuring board or mat on a firm, flat surface. Have another adult help keep the baby safely positioned.
Measure from the top of the head to the heels, gently straightening the legs without forcing them.
Record the result in inches or centimeters. One inch equals 2.54 centimeters.
3. Compare Both Measurements With the Size Chart
Find the clothing-size range that includes your baby’s current measurements.
If weight and length point to different rows, compare adjacent sizes and consider the garment’s cut.
A manufacturer’s body-size chart describes the child the garment is intended to fit. It does not necessarily show the physical dimensions of the clothing itself.
Why Baby Clothing Sizes Vary by Brand
Baby clothing sizes are not fully standardized across manufacturers. Each brand develops its own measurement ranges, garment cuts, and labeling system.
For example, Carter’s 6M bodysuit size covers 12.5–17 pounds and 24–27 inches. Gerber’s 3–6M size covers 12–16 pounds and 24–26 inches.
The labels differ, but their measurement ranges overlap considerably.
International sizing adds another difference. A US label such as 12M may be replaced by a numeric height label on European or Asian clothing.
Fabric construction also affects fit. A soft jersey bodysuit may stretch more than a structured woven outfit. Our guide to knit fabrics explains how jersey, interlock, and rib knits differ in stretch and structure.
Check the size chart for the specific product rather than assuming every item from a brand fits identically.
What If Your Baby Is Between Two Sizes?
If your baby’s measurements fall between two sizes, compare both options.
For everyday clothing, the larger size may offer room for growth if it still fits comfortably. However, excessively loose fabric, long sleeves, or oversized pant legs can interfere with movement.
Signs that clothing may be too small include:
- Snaps or zippers becoming difficult to close.
- Sleeves or pant legs becoming noticeably short.
- Tight waistbands or persistent pressure marks.
- Fabric pulling across the shoulders or diaper area.
- Restricted movement when your baby stretches or kicks.
If the larger size is too loose, consider a different garment cut or brand.
Be Careful When Sizing Baby Pajamas
Do not automatically size up snug-fitting sleepwear.
The U.S. Consumer Product Safety Commission requires children’s sleepwear above size nine months to meet applicable flammability requirements or qualify for a tight-fitting exception.
Snug-fitting sleepwear is designed to fit close to the body. Choosing an oversized version can defeat that intended fit.
Always follow the sleepwear manufacturer’s sizing and safety instructions.
Check the garment care instructions too. If symbols on the tag are unclear, Careonova’s laundry care symbol decoder can help explain the washing and drying requirements.
Preemie Baby Clothes Sizes
Preemie clothing is intended for babies who are smaller than typical newborn clothing ranges.
Gerber lists its preemie size for babies weighing up to 5 pounds and measuring up to 17 inches.
Carter’s lists a preemie size for babies weighing up to 6 pounds and measuring up to 18 inches. It also offers a separate UP5LB size for smaller babies.
These measurements are brand-specific.
When shopping for a premature baby, consider current weight, length, garment openings, and any special clothing requirements. If medical equipment or specialized care is involved, follow the baby’s healthcare team’s recommendations.
What Is the Difference Between 24 Months and 2T?
Both labels are associated with children around two years old, but they may have different cuts.
Clothing labeled 24M often allows more room around the diaper area and is designed with younger children’s proportions in mind.
Clothing labeled 2T generally follows toddler proportions and may have a narrower seat or different garment length.
However, not every manufacturer separates the two sizes. Gerber combines 24M and 2T in its general clothing chart, while Carter’s provides different measurements for some 24M and 2T garments.
If your child still wears diapers, pay attention to the waist and seat. Also check inseam length when buying pants.
Choose according to your child’s measurements and the garment’s actual fit.
How to Choose the Right Baby Clothes Size
Start with your baby’s current weight and length, then compare both measurements with the manufacturer’s chart. Use age as a general reference rather than a fixed sizing rule.
For international clothing, numeric sizes such as 70, 80, and 90 usually relate to height in centimeters, but their age equivalents vary.
The baby clothes size calculator can help identify a starting size. The final decision should depend on comfortable fit, unrestricted movement, and the garment’s intended use.
Once you have the right fit, follow the care label when washing new garments. For detergent guidance, see our baby laundry detergent guide .