Welcome. This short guide gives busy parents clear, research-tinged facts about a December baby’s personality, health patterns, sleep tips, and symbolic markers. We’ll use zodiac signs—Sagittarius and Capricorn—as a friendly lens, not a rulebook. Expect quick, scannable points that mix science, folklore, and practical parenting advice. Key previews: many people describe these newborns as lucky and generally healthy. Studies note a more even-keeled temper in some December-born groups. Holiday timing matters, too: Dec 24 and 25 are rare U.S. birth dates, so a winter birthday can still be uniquely timed. Look for winter symbols like narcissus, holly, and three blue birthstones. This article will help you celebrate your baby’s story and give simple, useful facts to guide the first year.