Dear Ahmed khan,
thank you for sharing your question with the Wefugees Community!
In general, it is possible that they will deport you if you enter Germany although you still have an entry ban. The correct way to go would probably be to file an application with the immigration office ("Ausländerbehörde") that issued your entry ban in the first place and ask them to shorten you entry ban.
You would have to explain your situation to them, especially that you have a German child you want to take care of. The immigration office would then decide if in their opinion it would be necessary for you and your child to live togehter even before your entry ban expires. But to be honest, I don´t know how good the chances are for such a request. But maybe someone else in the Wefugees Community has some knowledge or has been in a similar situation.
Please note that it could also happen that the immigration office will only shorten your entry ban if you pay the costs for your last deportation.
I hope his helps and please don´t hesitate reaching out to the Wefugees Community if you have further questions!
All the best
Note: Please keep in mind that we can´t provide qualified legal advice via the internet and that any information given can´t replace such legal advice.