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Jason is the most impregnate-able Bat because we all know by instinct that he'd rearrange his entire life to take care of his kid.
He's not just a Daddy, he's a Father. He would nurture the fuck outta that kid. He would read all the most accredited books, he'd be active on the parenting blogs, he'd be there at the PTA meetings.
Jason would be that special mix of terrified and excited to help this child grow up. He's the parent that a kid won't be too afraid to call when they've done something really stupid and they need help now. He's the parent who will work so hard during arguments to try to say the right thing.
We can all see Jason "Get Him Pregnant" Todd being such a loving dad at every milestone in his kid's life that we can't help but want to give him that kid.
(This message was sponsored by the supporters of @arandomao3user's campaign to get Jason Todd Pregnant.)