I have gray crib what color should I paint the walls, having a girl (not pink)

Yellow, or Orange 🍊

Lavender would be pretty or mint. You could even paint them white expect the wall the crib is going to go on then paint that one a pastel color

Mint or a light turquoise. And you could always add plain wall stickers, like polkadots

Id choose lavender i think gray and lavender go great together

Yellow