Want to make a bigger hat, need help adjusting the pattern

Hi, I really like this hat pattern, and would like to make it for a 1 1/2 to 2 year old. Any idea about cast on number, and when to add the ear flaps?
Thanks!
Kristyn

Try switching to a larger needle and chunkier yarn. Do a sample to see if this will work for you. Good luck.

Snowfleas suggestion is a good one and a simple way to enlarge the hat. Here’s a similar pattern with removable earflaps for an older child:

Cast on number is going to depend on the yarn weight but you could look on Ravelry for similar beanies in your yarn weight or do a swatch to determine your gauge and calculate the size from there.