Sheldon's aversion to anything pregnancy-related presented itself in both Young Sheldon and The Big Bang Theory, but Mandy's delivery in the former series prompted one detail about him that was often mirrored in the latter. Sheldon's social ineptitude came up in the most disparate ways in both sitcoms, and his friends' or sister's pregnancies often highlighted how he was prone to say the wrong thing at the wrong time. However, for someone so adamantly disgusted by anything pregnancy-related, who discussed the condition in practical terms that put his friends off any discussion about it, Sheldon was always there to provide support, no matter how unusually he did so.
While Sheldon's ambivalence came up even throughout Mandy's pregnancy in Young Sheldon season 6, where he wasn't as knowledgeable about it as he would have been in The Big Bang Theory, he still rose to the occasion as she needed help to reach the hospital. Sheldon's odd reaction to the rubber gloves provided comic relief, but it also highlighted his willingness to help despite it not being his place as he couldn't drive Mandy anywhere. Still, despite not being a responsible adult, Sheldon was able to find one who could have helped him and Mandy, even if the events all unfurled on the big day of his database launch.
Sheldon's ability to help Mandy despite having his mind focusing elsewhere and not having access to a responsible adult in Young Sheldon season 6, episode 14, "A Launch Party and a Whole Human Being," mirrored another time he supported someone close to him in The Big Bang Theory. Indeed, Bernadette's second pregnancy proved difficult with the bed rest and the due date passing by. While all her friends turned up at her and Howard's place to try and induce labor, it was only Sheldon who went there with the intention of providing company as they waited for the baby to arrive.
While Sheldon's idea to do so with a long and difficult board game was just as enjoyable for him, as he rarely would have had time for that had they not been waiting for Howard and Bernadette's son, it still showed his intent in offering support. His steadfast support of Bernadette in the form of just spending time with her wouldn't have been possible without Sheldon having to find Brenda so that she could accompany him and Mandy to the hospital. Indeed, Sheldon knew what to do with Bernadette because he already faced a similar challenge when he was just a young teen with Mandy, despite his aversion to pregnancy.
While Sheldon went out of his way to support Bernadette in The Big Bang Theory season 11, episode 16, "The Neonatal Nomenclature," that wasn't the first time he was there for his friends and family. The Big Bang Theory's series finale had Penny's unplanned pregnancy take considerable space, especially as learning about it produced a muted reaction in Sheldon, deeply angering Leonard. However, Sheldon's response was entirely on par with his usual approach to pregnancy, as he really never attributed particular importance to it.
Sheldon was there on both of Bernadette's deliveries, participating in the joyful moment even when they kept being sent home because Bernadette went too soon to the hospital. He did this despite Amy's birthday happening the same day as Halley's. Sheldon also went back home to Texas and took part in his sister Missy's home birth, despite the episode not shying away from showing how distressed he was because of it. Sheldon being the one to get Mandy to the hospital in Young Sheldon not only mirrored all the similar events in The Big Bang Theory but also explained why Sheldon always did so despite his disinterest in pregnancy.
