[Illinois] Can I Add my child to my after already submitting my claim

I submitted my claim about a week ago and I have a phone interview coming up in 5 days, can I add my child to my submitted claim . I see on my UI portal I can “File a claim” but I do not wish to do that in fear that it might start the process over .

Can I just tell the person when they interview me that I want to add my son?