With how popular these sock monkey hats are, I am tempted to start a mini sock monkey hat factory out of my kitchen 😉 This sock monkey hat is a free crochet pattern and is written for size 6  months.  My guess is that is may fit 3-9 months.. but as you all know, heads come in many shapes and sizes. If you are looking for other sizes, check out the 0-3 month sock monkey hat, Toddler Sock monkey hat, and the Child size sock monkey hat.