Elon Musk shared a rare photo of his newborn baby, X Æ A-Xii

• Elon Musk has shared a rare photo of his new baby.
• The Tesla and SpaceX CEO on Monday tweeted a photo of him holding his son with the caption "Das baby kann noch keinen löffel benutzen," which translates to "The baby cannot use a spoon yet."
• We've only seen a few photos of the new baby — whose full name is X Æ A-Xii Musk, but who the couple appears to be calling, simply, X — since Musk and his girlfriend, the musician Grimes, welcomed him on May 4.
• Since then, the couple has had to tweak part of his name from standard numerals to Roman numerals to comply with California state laws around naming a baby.

Elon Musk on Monday shared a rare photo of his new baby, X Æ A-Xii Musk.

"Das baby kann noch keinen löffel benutzen," Musk wrote in a caption accompanying a photo of him holding his son. The German phrase translates to "The baby cannot use a spoon yet."

—Elon Musk (@elonmusk) $4

We've only seen $4 of the new baby since Musk and his girlfriend, the musician Grimes, $4. Musk shared at the time that "Mom & baby all good" and announced the name: X Æ A-12 Musk.

Since then, however, the couple has had to tweak the name slightly to comply with California laws about naming a baby, which stipulate that the name can include only the 26 letters of the English alphabet. $4 that the couple changed the spelling of the baby's name to comply with the state law — the new spelling is "X Æ A-Xii," according to Grimes.

In mid-May, Musk appeared on the $4 and shared for the first time how he pronounces the name.

"It's just X, the letter X. And then the Æ is, like, pronounced 'ash,'" Musk told Rogan. "And then A-12 is my contribution ... Archangel-12, the precursor to the SR-71, coolest plane ever."

While it's still not quite clear how the latter half of the name is pronounced — whether it's "X Ash Archangel-12" or "X Ash A-12" — it appears that Musk and Grimes are keeping it simple day-to-day and $4