Congratulations.
As the others have said, please don't worry about it. I also note that you're extra worried because the baby is a boy. The jury is still out on whether AS is more prevalent in boys anyway. Many people think it's just under-diagnosed in girls (and that's what I truly believe too). So, I don't think your chances are higher, just because you know for sure it's a boy. In any case, it's impossible to tell what your child might be like.
I'm with ASDMommyASDKid on this one too. Many of us are of an age that we would never have been diagnosed with AS as a child. We only realised we might be on the spectrum, due to our children being identified or diagnosed. It's not all bad either. My daughter is a lot of work, that's undeniable. But, the highs are amazing and she has many positives, which I doubt would have been present, had she not been on the spectrum.
I worry about her, but everyone worries about their kids, no matter what. And there are some things I worry much less about than other parents. I'm not particularly concerned about peer pressure or my daughter getting into the wrong sort of company. OK, she's only 6 and I don't know what kind of teenager she's going to be. I'm not complacent, but STDs, teenage pregnancy and drugs are a bigger concern for my peers than they are for me (especially if she takes after Mummy).
There's another plus side to your story. If your child does have an ASD, they will be identified very young. As you are so clued up on the topic, you and your wife will notice traits, I'm sure.
Please don't worry and try to reassure your wife.
Good luck
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"We act as though comfort and luxury were the chief requirements of life, when all we need to make us really happy is something to be enthusiatic about." Charles Kingsley