Knee pads provide added protection but do not prevent all injuries.

Choosing the right size is easy! We offer sizes from newborn to 24 months. The best way to find your baby's size is to check our detailed size chart, which includes both length and weight ranges. Measure your baby's length from head to toe and check their current weight, then match these measurements to our chart. Keep in mind that the stretchable Lenzing Modal fabric extends up to 3 inches, so there's built-in room for growth. If your baby is between sizes, we recommend sizing up to allow for growth and comfort. If you're unsure, our customer service team is happy to help! Just let us know your baby's measurements and age, and we'll recommend the perfect size. Remember, a well-fitting Wonder Hero onesie should allow your baby to move freely while providing snug protection at the knees and feet.

We will work quickly to ship your order as soon as possible. Once your order has shipped, you will receive an email with further information. Delivery times vary depending on your location.

Thanks for your interest! At the moment, we only ship within the U.S. and do not offer international shipping.

We want you to be completely happy with your Wonder Hero onesie! If you're not satisfied with your purchase, we offer returns and exchanges within 10 days of delivery. Items must be unworn, unwashed, and in original condition with all tags attached. If there's a defect or quality issue, we'll make it right—just contact our customer service team with photos and details. For exchanges, we'll help you find the perfect size or design. We stand behind the quality of our products and want every baby to experience the comfort and protection of Wonder Hero!

Shipping times depend on your location and the shipping method you choose. For domestic orders in the US, we typically deliver within 5-7 business days. International orders usually arrive within 10-21 business days, depending on your country. You'll receive a tracking number with your order confirmation, so you can monitor your package every step of the way. During peak seasons, delivery times may be slightly longer. If you need your Wonder Hero onesie urgently, check out our expedited shipping options at checkout!

Absolutely! Wonder Hero onesies are specifically designed with sensitive skin in mind. Our hypoallergenic Lenzing Modal fabric is naturally gentle, breathable, and free from harsh chemicals. It's perfect for babies with eczema, allergies, or other skin sensitivities. The fabric is soft against delicate skin and won't cause irritation. Many parents with babies who have eczema have found that Wonder Hero onesies are one of the few clothing options their little ones can wear comfortably. The temperature-regulating properties also help prevent overheating, which can trigger eczema flare-ups. If your baby has specific skin concerns, we recommend consulting with your pediatrician, but we're confident Wonder Hero is a safe and comfortable choice for sensitive skin!

Yes! Wonder Hero onesies are safe and comfortable for sleep. The breathable Lenzing Modal fabric helps regulate your baby's body temperature, preventing overheating—an important safety consideration during sleep. The fabric is soft and gentle, allowing your baby to sleep comfortably without irritation. The mitten-style cuffs are also helpful during sleep, as they prevent your baby from accidentally scratching their face. The flexible foot design with grippy dots provides traction if your baby moves around during sleep. Many parents use Wonder Hero onesies as their go-to sleepwear because of the combination of comfort, safety, and protection. As always, follow safe sleep guidelines and consult with your pediatrician if you have specific questions about your baby's sleep setup.