It appears the claim the Elon Musk is developing a child-bearing robot is false, according to this fact-check from USA Today. This article is attributed to Gabrielle Settles, who, according to her LinkedIn profile, has contributed to USA Today for nearly 1.5 years, and before that, to PolitiFact for over 2 years. In the USA Today article, published October 30, Ms. Settles explains that: "During Tesla’s 'We, Robot' event on Oct. 10, Musk introduced a robovan and a robotaxi – but a pregnant robot wasn’t on the list." She goes on to point out that the YouTube transcript of the event shows Musk did not make any announcement about a pregnancy robot during his presentation. According to my Google search, there are seemingly no credible news reports about such an announcement, either. For these reasons, I believe it is safe to conclude that the claim is false.