These are made of felted wool fabric NOT the industrial acrylic felt. The toadstools are needle felted with Merino sheep's fleece. The butter color felt is 80% wool and 20% acrylic. I have felted the fabric before making the booties so they should stay the same size they are now. Size: They measure 4.25 inches from the heel to the toe and approximately 2 inches wide. Suggested size would be for a newborn up to 3 month old. Measure babies foot for exact size since some newborn or 3 month old babies do have big feet. Care: Hand wash with a mild detergent in lukewarm water. Rinse well and squeeze in a towel to remove excess water. Let air dry on top of a towel. Will come gift wrapped. Makes for a nice baby shower gift.