Here is the central tension: Leo is Fixed fire — it burns in one spot, bright and steady, demanding loyalty to its own center. Sagittarius Moon is Mutable fire — it sparks and scatters, chasing the next horizon before the current one cools. Your baby is simultaneously the sun that holds planets in orbit and the comet that refuses to orbit anything. You'll see this play out in real time: they'll claim a favorite toy, a favorite corner of the playmat, a favorite person — with absolute Leo conviction — and then abruptly need something entirely new, because their Sagittarius Moon has already emotionally moved on. Neither placement backs down easily, so the tension doesn't quietly resolve; it creates a baby who is both fiercely committed and genuinely restless.
What keeps this from becoming all contradiction is that both placements are fire. There's no cool-down layer between them, no earth to ground the combustion or water to dampen the enthusiasm. Your little Leo-Sag processes emotion through movement, expression, and volume — feelings are performed and released fast, not stewed over. This baby cries with complete sincerity and laughs just as completely, thirty seconds later.
Which rising sign your baby carries will reshape how this all lands on the outside. An Aries rising will accelerate everything and make them look even more fearless. A Capricorn rising puts a calm, deliberate face on a surprisingly impulsive interior. A Pisces rising softens the edges in ways that can genuinely surprise you once you see the Leo-Sag fire underneath.