Quick answer

Petit Bateau kids clothing generally runs true to size. Most parents find that following the official size chart and measuring your child is the most reliable approach. For a relaxed fit, consider sizing up, especially in pajamas and shirts.

Understanding Petit Bateau Sizing

Petit Bateau uses age-based sizing (e.g., 3A, 5A, 6A, 12A) which corresponds to the average child's age. However, children grow at different rates, so it's important to measure your child's height and chest and compare them to the size chart on the product page. This is especially true for items like swimsuits and fitted tops, where a precise fit matters more.

The brand's European heritage means the sizing is designed for a slim, classic cut. If your child is on the taller or broader side for their age, you may want to size up for extra length or room. Conversely, if they are petite, the age-based size should work well.

Frequently Asked Questions

Does Petit Bateau run small compared to US brands?

Petit Bateau runs true to its own size chart, which is based on European age standards. Compared to some US brands that run larger, Petit Bateau can feel slightly more fitted. Always measure your child and compare to the chart, not just the age label. When in doubt, size up for a fit closer to US brand sizing.

Should I size up for Petit Bateau pajamas?

Yes, many parents recommend sizing up for pajamas. Petit Bateau pajamas are made from a snug-fitting, flame-resistant fabric that fits closely. Sizing up provides a more comfortable, relaxed fit for sleeping. Size up one size for pajamas.

How do I find the right size for my child?

First, measure your child's height and chest. Then, open the size chart on the specific product page. Match your child's measurements to the chart. If they fall between sizes, consider the fit you want: snug (choose the smaller size) or roomy (choose the larger size). Always use the size chart on the product page.

Real product examples

  • SS25 - A0CXQ: This girl's floral swimsuit from Petit Bateau is a charming choice for the spring and summer season. Designed in a multi-color floral pattern, it brings a fresh, playful look to warm-weather adventures. Available in sizes 3A, 5A, 6A, and 12A. Swimsuits are fitted garments. For a snug, secure fit, order your child's usual size. If you prefer a little room to grow, or if your child is between sizes, choosing the next size up is a good strategy.
  • SS25 - A0CL1: Dress your little one in charming style with these baby girl floral bloomers from Petit Bateau USA. Part of the Spring Summer 2025 collection, this adorable bottom is designed for comfort and everyday cuteness. Available in a multi-color option, size 6M. Bloomers are meant to be slightly loose and comfortable. Sticking with your baby's current age size (6M) is usually perfect. If your baby is on the longer side, sizing up to 12M can provide more coverage.
  • SS25 - A0CYO: This Petit Bateau USA short-sleeve tee is part of the Spring Summer 2025 collection, designed for boys with a sailor-inspired style. It features a lobster logo on the chest, adding a playful touch to a classic white top. Available in size 8A. T-shirts are more forgiving. An 8A tee is designed for an average 8-year-old. If your child is 8 but tall or prefers a looser fit, sizing up to 10A is a common choice. The classic cut means it won't look oversized.