Should we correct our child?

Should we correct our child? When a child stutters (my son is 3 yrs old), should he be corrected ("don't say 'I-- I-- I--'"), or should we just ignore it and be supportive? I'm in the ignore it camp, but I'm having a hard time finding links to directly support that. Can anyone provide links supporting either position? He just started stuttering a month or so ago. I really just want to make sure we don't make it worse.