How to Choose the Right Bloomer Size for Your Baby
By Emile et lda - La marque de nosjours heureux | Published: 2026-10-30
Category: How-to Guides
Learn how to size baby bloomers correctly with our step-by-step guide. Get fit tips for denim and vichy styles, plus common sizing mistakes to avoid.
Quick answer
Measure your baby's waist and hips, then choose a bloomer size that leaves a little room for the elastic to sit comfortably—not tight—and allows free leg movement.
Why bloomer fit differs from pants
Bloomers are designed with a puffy silhouette and elasticated waist and leg openings. Unlike fitted pants, they don't need to hug the body. The right size should allow the elastic to rest gently without digging into the skin, and the leg openings should be snug enough to stay in place but loose enough to avoid red marks.
Because bloomers are meant to be roomy, sizing up is often safe. If you're between sizes, consider the fabric: denim has less give than cotton vichy, so you may want to size up for a denim bloomer to ensure comfort.
Denim vs. vichy: fabric matters
Denim bloomers are sturdier and hold their shape, but they have minimal stretch. A vichy cotton bloomer, on the other hand, is lighter and more breathable, with a bit more natural drape. This means the same size might feel different between the two fabrics.
If you're buying a denim bloomer for a baby who is between sizes, choose the larger size to allow for movement. For a vichy bloomer, the softer fabric can accommodate a closer fit, but still leave room for the elastic to sit comfortably.
Step-by-step bloomer sizing
- Measure your baby: Use a soft measuring tape to measure your baby's waist (at the navel) and hips (at the widest part). Also measure the thigh circumference at the top of the leg. Checkpoint: Write down these numbers and compare them to the size chart.
- Check the size chart: Each brand has its own size chart. Look for the waist and hip measurements that match your baby's. If your baby is between sizes, choose the larger size for comfort. Checkpoint: Don't rely on age alone—always use measurements.
- Consider the fabric and style: For denim bloomers with less stretch, size up if in doubt. For vichy cotton, the softer fabric may allow a closer fit, but still ensure the elastic isn't tight. Checkpoint: Think about how the bloomer will be worn—over a diaper or as a standalone bottom.
- Test the fit: When you receive the bloomer, try it on your baby. The waist should sit comfortably without leaving marks, and you should be able to slide two fingers between the elastic and your baby's skin. Checkpoint: Check the leg openings too—they should be snug but not constricting.
- Watch for growth spurts: Babies grow quickly. If the bloomer fits perfectly now, it might be too small in a few weeks. Consider buying a size up if you want to extend wear time. Checkpoint: Keep the receipt in case you need to exchange for a different size.
Bloomer styles to consider
- Bloomer - Denim bleu fleur brodée: This denim bloomer has an elasticated waist with a ruffle effect and hidden elastic around the thighs. The hidden thigh elastic helps the bloomer stay in place without being too tight, making fit more forgiving.
Bloomer - Denim bleu fleur brodée - Bloomer - Brodé vichy terracotta: This vichy cotton bloomer features an elasticated waist and elasticated leg openings with a ruffle effect. The soft cotton and elasticated leg openings provide a comfortable, flexible fit that adapts to your baby's movements.
Bloomer - Brodé vichy terracotta
