Most people expect a Scorpio baby to be intense, brooding, locked-in — the child who fixes you with a stare that seems to know exactly what you're thinking. And that's not wrong. But a Sagittarius Moon rewires how all that depth gets expressed, so instead of the still, watchful Scorpio archetype, you often get a baby who is simultaneously deep-feeling and restless, who can go from locked-on concentration to a sudden shriek of delight at something across the room, then back again in under a minute. The Fixed Water of the Scorpio Sun wants to hold, to absorb, to stay in a feeling until it's fully processed — but the Mutable Fire Moon keeps kicking that feeling loose before the processing is done.
This creates a genuinely interesting internal tension: your little Scorpio feels things at Scorpio depth, but Sagittarius Moon gives those feelings a buoyancy that prevents them from pooling into sulk or shutdown. Upsets tend to spike hard and fade faster than a classic Scorpio placement would predict. What lingers is the impression — your baby will remember the emotional texture of an experience long after the visible reaction has moved on.
How noticeably this push-pull shows up day to day depends significantly on the rising sign. An Aries or Gemini rising will push the Sagittarius restlessness right to the surface, making this baby read as nearly all fire and momentum. A Scorpio or Capricorn rising, on the other hand, will put a much quieter face on all that internal motion — the depth shows first, and the roving curiosity has to be earned.