What Size 70 Means in Baby Clothes

Size 70 in baby clothes usually means a baby about 27.5 inches (70 cm) long, with a rough age guide of 6–12 months. The number refers to the baby’s body length, not the garment’s length, and it does not translate into one guaranteed U.S. month size. Your baby’s measurements and the chart for the particular garment are the best way to choose a good fit.

Use this quick guide to interpret the label before buying.

What You’re Checking	General Guide for Size 70	What Determines the Fit
Baby’s body length	About 27.5 inches (70 cm)	The brand’s stated height range
Approximate age	Varies by brand	The baby’s measurements, not age alone
Weight	No universal weight range	The garment’s size chart and cut
U.S. size equivalent	No fixed month-label conversion	Matching height and weight across the two charts

How Height-Based Baby Sizes Work

Treat a numeric baby tag as a height guide, then use the retailer’s chart to choose the fit.

European baby sizing commonly uses body height in centimeters, and some imported baby clothes use a similar system. That makes a numeric tag useful, but it does not make every brand’s clothing interchangeable.

A brand may use the number as a target height or place it within a broader height interval. Meanwhile, U.S. brands create their own month-based size ranges. Converting directly from a numeric label to an age label can therefore lose the information that matters most: the measurements each garment is designed to fit.

The type of clothing matters, too. A stretchy bodysuit, a woven romper, and footed pajamas can fit differently even when their tags match.

How to Choose Baby Clothes in Size 70

Choose size 70 by matching your baby’s current length and weight to the exact garment’s size guide, then checking the intended fit.

Step 1: Get Your Baby’s Current Measurements

1. Measure your baby’s length while they are lying on a flat surface, from the top of the head to the heel. Gently straighten the legs without pulling.
2. Note their current weight from a recent measurement.

Keep both measurements handy while shopping. If the length measurement is difficult to take because your baby is moving, repeat it rather than making a purchase from a doubtful reading.

For a gift, ask the caregiver for the baby’s current measurements or the brand and size of something that fits well. Age alone is a less reliable starting point.

Step 2: Match Measurements to the Exact Garment

1. Open the size guide attached to the product, not just a general international conversion chart.
2. Check whether it lists body measurements or garment measurements.

Body measurements describe the baby. Garment measurements describe the clothing itself, such as its chest width or shoulder-to-crotch length. Do not compare your baby’s full body length with a romper’s garment length.

For a U.S. comparison, a 6–9M label fits babies from six to nine months (approximately 16–20 pounds). A 6–9M label can be a useful comparison for size 70, but it is not a universal conversion.

If a listing supplies neither usable body measurements nor garment measurements, ask the seller for them or choose an item with a clearer size guide.

Step 3: Account for the Garment’s Cut

1. Check whether the item is intended to fit snugly, loosely, or over additional layers.
2. If your baby’s height and weight fall into different sizes, compare the relevant dimensions or choose another cut rather than automatically buying the larger label.

Pajamas and a drop-shoulder sweatshirt can both carry a 12M label yet fit differently: pajamas may be snug for safety compliance, while the sweatshirt is designed to hang loosely.

Do not deliberately oversize snug-fitting sleepwear to create growing room.

For daytime clothing, a different style can solve a fit problem better than a larger size. A longer bodysuit may provide needed torso room without leaving the shoulders and neckline excessively loose.

Step 4: Try It On Before Keeping It

1. Try the garment over the diaper and any layer your baby will normally wear with it.
2. Fasten it fully and check that the fabric does not pull sharply across the chest or crotch.
3. Check that arms and legs can move comfortably. For footed clothing, make sure the feet are not crowded and the legs do not pull tight.
4. Keep the item for current use only if it fits as intended. Exchange a poor fit, or store a suitable larger daytime item separately for later.

A tag that looks “right” is not a reason to keep using clothing that is tight, restrictive, or slipping out of place.

When Smaller Infant Sizes Make More Sense

A numeric tag is not a substitute for choosing the right category of infant clothing. If the item’s chart is too large for your baby, compare smaller labels using the brand’s garment-specific measurements.

Choosing Preemie Clothes

Preemie is a separate size category, not another name for newborn. Preemie clothing is intended for smaller and premature babies; the garment’s size chart determines the fit.

Sizing can vary between brands. Use separate drawers labeled with each size range.

Choosing Newborn Clothes

Newborn, often abbreviated NB, is a separate size from 0–3M, not another name for it. Newborn typically fits babies 5–8 pounds.

Use a size chart that considers height and weight to choose the best fit.

Comparing Early Infant Month Labels

Some 0–3M clothing is sized for babies weighing approximately 8–12 pounds. That is a brand-specific fit range, not a promise that the clothing will last through a particular birthday.

Some 3–6M clothing is sized for babies weighing approximately 12–16 pounds. Match the baby to the garment chart rather than waiting for the starting age on the label.

A baby can already need a 3–6M garment at 9 weeks. The age printed on clothing is a shopping guide, not a deadline or a measure of development.

When Larger Baby and Toddler Sizes Fit Better

Buying ahead can be useful, especially with hand-me-downs, but a larger label is worthwhile only if the clothing will suit the child when it fits.

Choosing Clothing Labeled 12M

If the current garment is too short or restrictive, compare the next available size using measurements rather than jumping to a label based on age.

Some 12M clothing is sized for babies weighing approximately 20–24 pounds; match the garment’s height and weight ranges rather than choosing by age alone.

When buying for a later season, avoid building a whole wardrobe around an estimated future size. A small selection of versatile pieces is less likely to go unused than a large bundle of highly seasonal outfits.

Choosing Between 24M and 2T

Do not assume 24M and 2T are always identical, or always different. Some brands combine them, while others use different measurements or cuts.

Gerber’s combined 24M/2T baby-and-toddler clothing size lists a fit range of 28–32 pounds and 32–34 inches tall; match both weight and height. Toddler ranges vary by brand, so check the size chart.

When choosing between the two labels elsewhere, compare the product charts and the garment shape. Pay attention to torso length, waistband fit, and room over the diaper rather than choosing by the label alone.

How to Avoid Wrong-Size Buys and Clothing Waste

Once a garment fits, save the useful details: its brand, original size label, garment type, and the baby’s measurements at the time. A note such as “fits well in this brand’s bodysuits” is more useful than treating every item with that tag as interchangeable.

For secondhand clothing, compare actual dimensions with a similar garment that already fits. Lay both items flat and compare the relevant areas: torso length for bodysuits, leg length for pants, or shoulder-to-foot length for footed clothing. Compare like with like; a loose sweatshirt is not a useful template for snug pajamas.

Previously worn clothing can differ from its original chart because of shrinkage or stretching. Its current dimensions matter more than a conversion chart alone.

When organizing shared clothes:

• Keep original labels readable instead of relabeling everything with a guessed U.S. age size.
• Separate clothes that fit now, clothes for later, and clothes to pass on.
• Add a fit note when a garment runs noticeably shorter, longer, narrower, or wider than similar pieces.
• Keep sleepwear’s fit and care information with the garment.

Before buying another bundle, check what already fits and identify the actual gap, such as daytime bodysuits or pants, so the next purchase adds useful clothing rather than another uncertain size.

Frequently Asked Questions

What Is Size 70 on SHEIN or Temu?

Size 70 usually indicates a height-based baby size for about 27.5 inches (70 cm), but it is not a guaranteed U.S. month size on either marketplace. Use the size guide on the individual listing, and check whether its numbers describe the baby’s body or the garment itself. If the chart is unclear, request measurements before ordering.

Is Size 70 a Toddler Size?

Size 70 is generally an infant size, not the equivalent of a U.S. 2T. A listing may place it under a broad “kids” or “toddler” category, but that category does not determine the fit. Choose using the item’s measurements rather than the department name.

Is 18-Month Clothing 12–18 or 18–24 Months?

An 18M label is an age guide, so use the brand’s chart to determine fit. An 18M label fits babies around a year and a half old (approximately 24–28 pounds). Compare those measurements with the child’s current size before choosing the garment.