[PsychoPere]

Ryan8bit wrote:

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And if this show had any decent sort of realism, the baby would more than likely be Shane's. It might seem like it's been a long time since they were together, but I think Rick has only been back with Lori for a little over a week. That's not really enough time for a pregnancy test to be effective.

For anyone who might be curious how the comics handled this:

In the comics, since Shane is already dead by the time they realize that Lori is pregnant, the question of who is the father is basically shrugged aside. Rick briefly addresses the topic by saying he couldn't handle having a definitive answer when Lori attempts to discuss it, and from there after it's a non-issue.