Our Tiny But Mighty & Fierce From the Start infant bodysuit is the perfect shirt for a little one who has overcome challenges in their life—whether they are a NICU baby or a surgery warrior, or they have experienced family hardships. This onesie will show the world just how mighty they are. We use Carter's 100% cotton infant bodysuits. It features black stretch heat transfer vinyl (HTV) and is machine washable. We recommend line drying to keep it looking it's best.