Can my baby get HIV by touching semen in a car seat? What if it was dry?

Relax, Don. We know from the old days when HIV wasn't treatable that family members don't infect each other without intimate contact. And dried semen won't infect anyone, nor has anybody gotten sick from "safe sex" in which semen can end up on the skin. Let's practice good housekeeping and car-keeping, especially now that you're a grown man and a Dad -- but don't worry about HIV from this.
NO , unlikely. Fortunately HIV virus will not survive out side body fluids , will not able to enter body with intact skin.