Hi l will love to know about German law for child...

A child born in Germany is considered a German citizen at birth if one of the parents held German citizenship at the child's birth, or has been legally residing in Germany for at least eight years and holds a permanent residence permit.
“Legal” in this context means that you have a residence permit continuously throughout the eight years of residence. Your period of stay during the asylum procedure does not count if your asylum application is accepted at the end of the process.
Note: If the mother is not married, and only the father of the child has German citizenship (or has been legally residing in Germany for at least eight years and has a permanent residence permit), the father must officially recognize the paternity so that the child can acquire German citizenship .
If neither of the parents fulfills the above conditions, the child will not automatically obtain German citizenship, but you can naturalize your child later.