Maternity Clothes Sizing Made Simple

Your body is evolving every day of pregnancy, and with it comes the question: how do I find maternity clothes that fit? At A Pea in the Pod, we design clothing that grows with you, taking the guesswork out of sizing. Our approach is simple: start with your pre-pregnancy size, and let our silhouettes and fabrics do the rest.

How Maternity Sizing Works

Unlike standard shopping, maternity sizing is designed to reflect the size you wore before pregnancy. If you wore a size 6 pre-pregnancy, you’ll most likely wear a size 6 or a medium in maternity. The difference lies in the details. From side ruching to stretch panels, maternity clothes are thoughtfully designed to adapt as your bump grows, while still feeling like your style.

It’s important to remember that your body will change in unique ways throughout pregnancy. Some women start to show earlier, while others notice changes later. For more on when you might start seeing and feeling those changes, read this guide on when you start to show during
pregnancy.

Why Fabric and Fit Matter

Maternity clothes aren’t just about sizing; they’re about comfort and flexibility. Our designers select fabrics that stretch, drape, and recover beautifully, so your pieces move with you. Learning how your body may grow in the coming months can help you anticipate fit.

This month-by-month pregnancy body changes guide is a helpful reference as you shop.

Ditch Tight Waistbands—Go With Supportive Alternatives

Waistbands that dig or roll can quickly make you feel miserable. Instead, choose over-the-bump styles like leggings or soft skirts with panels, or rely on adjustable, drawstring options. Jenny Greenstein notes these choices relieve discomfort and offer flexibility as your body grows. Learn more from The Bump.

Maternity Size Guide

Here’s our simplified guide to help you find your size quickly:

XS = US 0–2

S = US 4–6

M = US 8–10

L = US 12–14

XL = US 16

When to Consider Sizing Up

Every pregnancy is different. While most women can confidently shop their pre-pregnancy size, some may prefer to size up in the later trimesters, especially in fitted styles. Your bust and hips may shift as well, making certain silhouettes more comfortable in a larger size. Not sure?

Here’s a guide on how to measure yourself during pregnancy to make sizing even easier.

The Fourth Trimester

Sizing doesn’t stop after baby arrives. Many women continue to wear their maternity clothes during postpartum recovery. Comfortable waistbands, nursing-friendly tops, and soft fabrics can make this transition seamless.

For more on how your body shifts after delivery, explore postpartum body changes you can expect.

The Bottom Line

Maternity sizing should make you feel confident, not confused. At A Pea in the Pod, we design with intention, clothing that looks and feels beautiful from your first trimester to your fourth. Start with your pre-pregnancy size, trust the thoughtful details in every silhouette, and enjoy the journey of dressing your changing body with ease.