You can either send written correspondence to USCIS with a copy of the birth certificate or wait until called for an interview to inform USCIS. If you decide to notify USCIS in advance, make sure to include the filing receipt and your alien number in your cover letter. You can read more about adjustment of status at http://myattorneyusa.com/adjustment-of-immigration-status.
Answered on May 19th, 2016 at 2:31 PM