Residence act 60a (2) deportation shall be suspended if its impossible in legal facts and law which make a deportation impossible - in your case your Vaterschaft and Sorgerecht.
60a (4) the deportation of a foreigner acknowledging paternity shall be suspended untill the procedure pursuant to section 85a has been concluded by means of enforceable decision.
You are not entitled to get a residence permit 28(3) once your child receives German passport . If you have a lawyer I recommend you to contact him or her and think about speaking with the Ausländerbehörde to be issued with duldung as you finalise the paternity