Start with Pale Gray on the walls and the whole nursery settles down. It is a soft, warm gray that never feels cold or heavy, which is exactly what you want around a sleeping baby. It quiets the room, hides little smudges better than bright white, and makes a lovely backdrop for everything from light wood furniture to a gallery of tiny frames.
Then bring in Powder Pink as your accent, just a gentle blush on the crib wall, the curtains, or a soft rug. It keeps the room sweet and girlish without going loud or sugary. Bright White finishes the trim, doors, and crib so the whole space feels fresh and clean. Walls in gray, white on the woodwork, and pink saved for the soft touches you can easily change as she grows.