This one is a thank-you note set to music. Natti Natasha keeps coming back to one date: "Hoy es 1 de noviembre" (Today is November 1st), and to the idea that "Dios vuelve a premiarnos" (God rewards us again) with "el milagro de la vida" (the miracle of life). That little word vuelve matters: it means this has happened before, so the gift is arriving a second time.
The verses zoom in on a newborn: a sun "que brilla en los ojos de un niño" (that shines in a child's eyes) and "un corazón pequeño que late" (a small heart that beats) and changes the singer's own destiny. Then the last verse makes it clear there are now two of them: "Serán dos estrellas jugando" (They will be two stars playing), "Hermanas que llevan en su alma" (Sisters who carry in their soul) the family's legacy and prayers. It is sweet, very direct and openly religious, and it doubles as a nice lesson in the future tense with serán.