I am trying to adopt a baby. my agency called me about a 3 week old baby boy. he appears healthy, but he has a 6 year old brother(different fathers) who has this type of muscular dystrophy. I read that it is genetic. As soon as the baby gets insurance they are going to do testing to see if he has it or is a carrier for it. my qeustions are:
1. what are the chances he will have it as well?
2. can it be diagnosed at 3 weeks of age to tell if he will develope it?
3. what type of tests should they run to determine this?

they are waiting for the testing before they adopt him out.

Thank you.