Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
How do you know you are the father of the baby?
She would not have known after just a week.
Have you been speaking to her recently?
She may not have told you the truth
Have you asked the mother if she will agree to a DNA test?
When did you last see here?
So how do you know all these things?
So there is no realistic reason to believe the child is yours and you have not asked the mother about it?