I bought them for his sister in size 3T. His sister is now 7 years old and he is 4, so they have been worn, loved, washed harshly and lasted the distance. They are lovely soft fabric but tough, such great quality and have lasted so long. I love the design with great little pockets for rocks and treasures (particularly for girls - and I love this brand's dresses for that as well!!). They have survived two energetic playful children. Both children are slow growing, super skinny so they wear clothing until it is completely worn out - I can't overstate how much these pants have been through and are still fantastically wearable. These pants have lasted the distance. I am now buying them in size 4T because I know they'll last him years and I'll hand them down to his cousins.