What size are the Birth Posters? We offer the Birth Posters in 2 sizes: The size of the Solo Baby and Duo Baby Poster is 50x70 cm (19.7”x27.6”) The size of The Trio Baby Poster is 100x70 cm (39.4”x27.6”). Related articles What is a Birth Poster? What is the paper quality used on Birth Posters? Paper, sizes and formats of design posters Does the poster come with the frame? How do I contact Optimalprint?