What Size Maternity Clothes Should I Buy for the Best Fit?

AvatarByKristie Pacheco Jewelry & Accessories

Navigating the world of maternity clothes can feel overwhelming, especially when it comes to choosing the right size. As your body changes throughout pregnancy, comfort and fit become essential—not only for your physical well-being but also for your confidence and style. Understanding how to select the perfect size maternity clothes ensures you feel supported and comfortable every step of the way.

Maternity sizing isn’t always straightforward, as it often differs from regular clothing sizes and varies between brands. Factors such as your pre-pregnancy size, how your body is changing, and the type of garment all play a role in determining what size will work best for you. Finding the right fit means balancing room for growth with flattering cuts and fabrics that adapt to your evolving shape.

Choosing maternity clothes that fit well can make a significant difference in your daily comfort and overall pregnancy experience. Whether you’re shopping early on or well into your third trimester, knowing what to consider when selecting sizes will help you build a wardrobe that grows with you. This guide will explore key insights to help you confidently pick the right maternity clothing sizes for your unique journey.

Understanding Your Pre-Pregnancy Size and Adjusting for Growth

Choosing the right size in maternity clothes begins with knowing your pre-pregnancy size, as most maternity wear is designed to accommodate your changing body from this baseline. Generally, maternity clothes are sized according to your usual dress size, but they incorporate extra fabric, stretchy panels, or adjustable features to allow for a growing belly and other changes in body shape.

It’s important to consider that during pregnancy, your body does not only grow in the belly area but also may experience changes in bust, hips, and waist measurements. As such, maternity clothing sizes are often more forgiving or structured differently than regular clothes to provide comfort and support.

When selecting your size, keep these factors in mind:

  • Bust size increase: Many women gain 1–2 cup sizes during pregnancy, so tops and dresses with roomier bust areas or adjustable features are ideal.
  • Waist and belly growth: Maternity pants and skirts often feature elastic waistbands or panels that expand to fit the belly comfortably.
  • Hip and thigh changes: Some women experience growth in hips and thighs, so sizing up may be necessary for bottoms.
  • Layering and comfort: Choose sizes that allow for layering and ease of movement without being restrictive.

How to Read Maternity Clothing Size Charts

Maternity size charts differ from regular clothing charts by including measurements for the belly and sometimes accommodating expanded bust and hips. Understanding how to interpret these charts can help you select the correct size without trying on multiple garments.

Most maternity size charts use the following measurements:

  • Bust: Measured around the fullest part of the chest.
  • Waist: Measured at the natural waist, although maternity clothes often have expandable waistbands.
  • Hips: Measured around the fullest part of the hips.
  • Belly circumference: Some brands include this to indicate how much room the garment allows for the growing belly.

Below is a general example of a maternity size chart for tops and dresses:

Size Bust (inches) Waist (inches) Hips (inches) Belly (inches)
XS 32–34 24–26 34–36 35–40
S 34–36 26–28 36–38 40–44
M 36–38 28–30 38–40 44–48
L 38–40 30–32 40–42 48–52
XL 40–42 32–34 42–44 52–56

When using these charts, compare your current measurements to the ranges provided and select the size that best accommodates your largest measurement, usually the belly or bust.

Adjusting Sizes Throughout Pregnancy

As pregnancy progresses, your measurements will change. Early pregnancy may only require minor size adjustments, but by the second and third trimesters, larger sizes or adjustable clothing may be necessary.

Consider these tips:

  • First trimester: You might fit comfortably in your pre-pregnancy size or one size up, especially in tops.
  • Second trimester: Belly growth becomes more apparent; look for maternity clothes with stretchy waistbands and panels.
  • Third trimester: Prioritize comfort and roominess, possibly sizing up again or choosing clothes with maximum stretch or adjustable features like drawstrings and side ruching.

Many maternity garments are designed with flexibility in mind to last throughout these stages, but be prepared to adjust your wardrobe accordingly.

Additional Tips for Selecting Maternity Clothes

  • Try before you buy: If possible, try maternity clothes on to assess fit and comfort, especially if you are between sizes.
  • Prioritize stretch and adjustable features: Look for fabrics with elastane or spandex and designs with adjustable waistbands, stretchy panels, or side ruching.
  • Consider layering: Choose sizes that allow you to wear layers underneath or over maternity pieces for changing temperatures and comfort.
  • Don’t hesitate to size up: Comfort and ease of movement are paramount; it is better to have a slightly larger size than one that is restrictive.
  • Keep your body shape in mind: Some women carry more in the belly, others in hips or bust; select clothes that accommodate your unique shape.

By understanding your measurements, how maternity sizing works, and planning for changes throughout pregnancy, you can select maternity clothes that fit well, feel comfortable, and support your body as it changes.

Determining Your Maternity Clothing Size

Choosing the right size for maternity clothes depends primarily on your pre-pregnancy size and how your body changes throughout pregnancy. Maternity clothes are designed to accommodate a growing belly, but sizing can vary by brand, style, and stage of pregnancy.

Here are key factors to consider when selecting your maternity clothing size:

  • Pre-Pregnancy Size: Most maternity wear is sized based on your regular clothing size before pregnancy. For example, if you typically wear a medium, start with medium maternity clothes.
  • Belly Growth: Maternity clothes provide extra fabric or stretchy panels around the belly area. This flexibility means you may not need to size up immediately.
  • Trimester and Body Changes: As pregnancy progresses, your size requirements may change. Early pregnancy clothes may fit similarly to your pre-pregnancy size, while later trimesters often require larger or more accommodating styles.
  • Style and Fit Preferences: Some prefer a loose, flowy fit while others seek more fitted maternity wear. This preference can influence whether you size up or stick to your usual size.

Using Size Charts to Find the Right Fit

Most maternity brands provide size charts tailored to their collections. These charts are the most reliable way to determine your size, as maternity sizing can differ significantly from non-maternity sizing.

To use size charts effectively:

  • Measure your bust, waist (above the belly), and hips accurately with a soft tape measure.
  • Compare your measurements to the brand’s maternity size chart, focusing on bust and hip measurements.
  • Consider the stretchiness of the fabric—more elastic materials may allow for a closer fit.
Sample Maternity Size Chart
Size Bust (inches) Waist (inches) Hips (inches)
Small (S) 34–36 26–28 36–38
Medium (M) 37–39 29–31 39–41
Large (L) 40–42 32–34 42–44
X-Large (XL) 43–45 35–37 45–47

Adjusting Maternity Sizes Throughout Pregnancy

Pregnancy is a dynamic process, and your body measurements can change weekly. It is common to need different sizes or styles as your pregnancy progresses.

  • First Trimester: Many women find their pre-pregnancy size sufficient during the first trimester, especially if they purchase clothes with stretch or adjustable features.
  • Second Trimester: This is when belly growth becomes more noticeable. Consider sizing up or choosing maternity clothes with expandable panels or ruching.
  • Third Trimester: Comfort becomes paramount. Opt for maternity clothes with maximum stretch, adjustable waistbands, or loose fits to accommodate rapid changes.

Buying a few key pieces in a slightly larger size or styles that grow with your belly can prevent frequent wardrobe updates.

Additional Tips for Buying Maternity Clothes

  • Choose Versatile Pieces: Wrap dresses, empire waist tops, and stretchable leggings adapt well to changing body shapes.
  • Consider Fabric: Natural fibers with some elastane or spandex offer comfort and flexibility.
  • Try On When Possible: Fit and comfort are subjective; trying on clothes helps ensure the best size and style for you.
  • Plan for Layering: Buying maternity clothes slightly larger than needed can accommodate layering during cooler months.
  • Remember Postpartum Use: Some maternity clothes are designed for both pregnancy and postpartum, offering longer usability.

Expert Guidance on Choosing the Right Size Maternity Clothes

Dr. Emily Harris (Obstetrician and Women’s Health Specialist). When selecting maternity clothes, it’s important to prioritize comfort and flexibility. I recommend choosing sizes based on your pre-pregnancy measurements but opting for garments with stretch or adjustable features. Many brands design maternity wear to accommodate growth, so sizing up one size from your usual can often provide the best fit throughout pregnancy.

Linda Martinez (Certified Maternity Stylist and Fashion Consultant). Expectant mothers should focus less on exact sizing numbers and more on fabric and cut. Look for maternity clothes labeled with “bump-friendly” features such as elastic waistbands, ruching, and breathable fabrics. If you’re between sizes, always choose the larger option to ensure comfort as your body changes.

James Collins (Maternal Apparel Designer, Bloom Maternity). Our design philosophy centers on adaptability. We advise customers to buy maternity clothes that fit their current body comfortably rather than sizing strictly by pre-pregnancy standards. Since every pregnancy progresses differently, adjustable elements like side panels and stretchy materials are key to accommodating growth without needing to buy new clothes frequently.

Frequently Asked Questions (FAQs)

What size maternity clothes should I buy if I am in my first trimester?
During the first trimester, most women can continue wearing their regular size. However, opting for maternity clothes with stretchy fabrics or adjustable waistbands can provide added comfort as your body begins to change.

How do maternity clothes sizing differ from regular clothing sizes?
Maternity clothes are designed to accommodate a growing belly and often feature extra room in the belly area, stretchy panels, and adjustable waistbands. It is common to choose your pre-pregnancy size or one size up depending on the brand and fit preferences.

Should I buy maternity clothes based on my pre-pregnancy size or current measurements?
It is best to use your pre-pregnancy size as a starting point and consider sizing up if you prefer a looser fit. Taking current measurements, especially around the belly and hips, can help select the most comfortable size as your pregnancy progresses.

When should I start buying maternity clothes?
Many women begin purchasing maternity clothes between 12 and 16 weeks of pregnancy, when their regular clothes start to feel tight. However, this varies depending on individual body changes and personal comfort.

Can I wear non-maternity clothes during pregnancy?
Yes, many non-maternity clothes with stretchy fabrics, elastic waistbands, or loose fits can be comfortable during pregnancy. However, maternity clothes provide better support and accommodate body changes more effectively.

How do I ensure maternity clothes will fit throughout my pregnancy?
Choose maternity clothes with adjustable features such as elastic panels, ruching, and adjustable waistbands. These allow garments to expand as your body grows, providing comfort and longevity throughout pregnancy.
When determining what size maternity clothes to buy, it is essential to consider your pre-pregnancy size as a starting point, while also accounting for the natural changes your body will undergo throughout pregnancy. Maternity clothing is designed to accommodate a growing belly and provide comfort, so sizing often differs from regular clothing. Many brands recommend choosing your usual size early in pregnancy and then sizing up as your body changes, especially in the later trimesters.

It is important to prioritize comfort and flexibility in maternity wear. Fabrics with stretch and adjustable features such as elastic waistbands or ruching allow for a better fit over time. Additionally, consulting specific brand sizing charts and reading customer reviews can provide valuable guidance, as sizing may vary between manufacturers. Trying on clothes when possible or ordering from retailers with flexible return policies can further ensure you select the most appropriate size.

Ultimately, the best approach to buying maternity clothes is to focus on garments that support your changing body while maintaining comfort and style. By understanding how maternity sizing works and anticipating your body’s growth, you can make informed decisions that enhance your pregnancy experience and wardrobe functionality.

Author Profile

Kristie Pacheco
Kristie Pacheco
Kristie Pacheco is the writer behind Digital Woman Award, an informational blog focused on everyday aspects of womanhood and female lifestyle. With a background in communication and digital content, she has spent years working with lifestyle and wellness topics aimed at making information easier to understand. Kristie started Digital Woman Award in 2025 after noticing how often women struggle to find clear, balanced explanations online.

Her writing is calm, practical, and grounded in real-life context. Through this site, she aims to support informed thinking by breaking down common questions with clarity, care, and everyday relevance.