Sheldon (Jim Parsons) may have caused Penny's (Kaley Cuoco) pregnancy in The Big Bang Theory. For years, CBS stagnated the Hofstadters' arc in the sitcom to focus on other stories. In an effort to rectify this in The Big Bang Theory's final season, it introduced a marital issue for the pair after Penny revealed that she didn't want to have kids, whereas Leonard (Johnny Galecki) was adamant about growing a family with her from the day they met.
Throughout their years of dating, this never became an issue for the couple. Despite the poorly established conflict, The Big Bang Theory moved forward with the arc, stretching out the plotline and introducing other factors that made it more complicated. For some reason, however, Leonard and Penny didn't have any extensive discussions about the matter. Instead, Leonard simply compromised and didn't push back on his wife's decision, although he clearly wasn't happy about it. It was The Big Bang Theory's opportunity to tackle a grounded issue within its comedic setting. Unfortunately, they didn't take that chance. Instead of properly exploring the nuances of the situation, they came up with a last-minute resolution with the reveal that Penny got accidentally pregnant.
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The revelation that Penny and Leonard were expecting came during The Big Bang Theory finale. Apparently, they conceived their first kid after she spent the night drinking with Sheldon on the heels of his Nobel Peace Prize in Physics win with Amy (Mayim Bialik). Beyond that, it's uncertain what Penny and Leonard's initial reaction was upon learning about the big news, but it appeared as if both were thrilled despite her initially being
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