For an enchanting "It's a Girl" centerpiece, begin with a crown-shaped foil balloon with "Princess" written on it as the central element. Add a printed foil balloon with polka dots and "It's a Girl" printed on it to enhance the theme. Incorporate pom poms in coordinating colors to add texture and flair. Complete the look with an "It's a Girl" banner and a few delicate butterflies for an extra touch of charm and whimsy. This combination creates a delightful and celebratory centerpiece, perfect for welcoming the new baby girl.