If u r filing i140 n i485 together, u have to include the health check up n birth certificate in the same application. If ur birth certificate was made just a year ago, it's advised to get two affidavit, one from each parent, stating your birth on that day in that place. It's prederred that birth certificate be issued on the year of birth, if it is not, having birth affidavits with birth certificate is the way to go.