Celebrity Parents Elon Musk Shares New Photo of Son X AE A-Xii on Twitter: 'The Baby Cannot Use a Spoon Yet' The Telsa founder and his girlfriend, Grimes, previously welcomed their son back in May By Nicholas Rice Nicholas Rice Instagram Twitter Nicholas Rice is an Associate Editor for PEOPLE Magazine. He began working with the brand as an Editorial Intern in early 2020, before later transitioning to a freelance role, and then staff positions soon after. Nicholas writes and edits anywhere between 7 to 9 stories per day on average for PEOPLE, spanning across each vertical the brand covers. Nicholas has previous work experience with Billboard, POPSUGAR, Bustle and Elite Daily. When not working, Nicholas can be found playing with his 5 dogs, listening to pop music or eating mozzarella sticks. People Editorial Guidelines Published on July 21, 2020 08:34 AM Share Tweet Pin Email Elon Musk is enjoying some quality time with his baby boy. On Tuesday, the Telsa founder, 49, shared a sweet shot on Twitter of himself holding his son, X AE A-Xii, whom he shares with girlfriend Grimes. Looking lovingly into the baby's eyes, Musk captioned the snapshot in German, "Das baby kann noch keinen löffel benutzen," which translates in English to, "The baby cannot use a spoon yet." The tech mogul's photograph comes a day after Forbes announced that his net worth has surpassed $74 billion, now making him the fifth-richest person in the world. Elon Musk and Grimes' Newborn's Name, X Æ A-12, Is Technically Legal but 'Won't Be Accepted' The SpaceX CEO and the singer, 32, initially named their baby boy X Æ A-12, but a birth certificate obtained by The Blast showed that the duo had changed the unconventional moniker to X AE A-Xii. In the document, the child's first name is listed as X, while his original middle name — which featured the "Æ" symbol and the number "12" — has been altered to AE A-Xii. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. Elon Musk and son X. Elon Musk Twitter Family law attorney David Glass told PEOPLE back in May that California only accepts the use of the 26 characters in the English language for baby names as the state "has been struggling with using symbols." "Thus, you can't have numbers, Roman numerals, accents, umlauts or other symbols or emojis," he said. "Although an apostrophe, for a name like 'O'Connor,' is acceptable." Grimes Shares Sweet Video of Boyfriend Elon Musk Cuddling with Newborn Son X Æ A-12 Grimes and Elon Musk. Taylor Hill/Getty While X AE A-Xii's name is certainly still an unconventional one, Grimes recently told Bloomberg that she refers to her baby boy as "Little X" for short. The new mom previously gave fans some insight into what their son’s unique name meant, explaining on Twitter that X represents “the unknown variable” and "Æ, my elven spelling of Ai (love &/or Artificial intelligence).” RELATED VIDEO: Elon Musk Shares First Photos of New Son with Grimes She went on to share that part of the name is a nod to the CIA's Lockheed A-12 reconnaissance plane, which has “no weapons, no defenses, just speed. Great in battle, but non-violent.” The "A" in the name also represents "Archangel" — which she said is her "favorite song" — while the number "12" stood for the Chinese zodiac sign of the rat. She also broke down the pronunciation of the name, telling one Instagram user earlier this year: “It’s just X, like the letter X. Then A.I."