I barely remember that episode to be honest. Keep in mind you're referencing an episode from a show over 20 years ago. So my issue is with what is now a tired, worn out writing gimmick.
Wow...using expired tropes can be dangerous to the health of a TV show! And there is another dangerous trope being developed...the zombie/human hybrid baby? They will not be able to trope the baby unless they come up with something magical to make it age rapidly and be full grown in time to mess things up for everyone a couple episodes later.