When I was four months pregnant the father of my son took off.?

It would be best to talk to a lawyer that is involved with the family court in your state. In most states, the birth father has to be willing to sign his rights and responsibilities for the child over so that the child can be adopted. Some states require that the mother be married to the person that will be legally adopting the child and in the end it is up to the judge who has your case as to whether he will allow the birth father to give up his rights and allow another person to adopt. It can be very complicated and to get the correct information your best option would be to speak to a lawyer.