I was also worried about how my then 3 yr old son would react. When he first saw me, after I came back from having my hair shaved off wearing a hat and scarf, he didn't bat an eyelash. He said, "I love you, mommy! I want a hat and scarf, too." So we found him a ski cap and scarf and tied it around his head, and he sported it for a few minutes. He didn't have a problem with it. Some weeks or months later, he accidentally pulled off my hat and saw me bald for the first time. He seemed just slightly surprised, but didn't react in any other way, didn't say anything or cry or anything, and he then immediately accepted it as mommy's new look. After that, I was still hiding my bald head from my husband, but not my son.