Whenever your priority date is current: for the I-485 application you will need the current fees, 2 passport style photos for each of you, an immigration medical exam for each of you (find a doctor here https://my.uscis.gov/findadoctor) , copy of your passports, visas and current I-94, copy of marriage certificate, and copy birth certificate for your son with certified translations if necessary and a police record from your local police station showing that you have no local record.
Good luck to you and I hope this answer has helped you!
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