This garment is a part of Columbia's Insect Blocker line and is treated with Permethrin, like their other items. Permethrin is 100% safe - pet safe, child safe, you name it. A baby could put the fabric in their mouth and it wouldn't hurt them. In addition to safety Columbia says their Insect Blocker line retains 90% effectiveness after 70 home washes, so Permethrin essentially does not wash out! I've been very pleased with my Insect Blocker and will definitely be trusting it for my next outdoor summer excursion.