Dexter and Dee Dee's relationship might become more cooperative. Since they are going to be siblings to the new baby, they might start to work together more often. For example, they could team up to decorate the baby's room. Instead of Dee Dee constantly barging into Dexter's lab, she might start to ask permission more politely because she realizes that Dexter is also stressed about the new baby coming.
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A plot could involve the family preparing for the new arrival. Dexter and Dee Dee could be sent on errands to buy baby supplies. Along the way, they get into all sorts of wacky adventures. Maybe they accidentally mix up the baby stuff with some of Dexter's lab equipment at the store. And as the mom's due date approaches, there could be some chaos in the house as everyone tries to get everything ready, with Dexter constantly getting distracted by his lab work but still wanting to be helpful for his mom during this special time.
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