Stylish and fashion design make your baby more attractive Great for casual, Daily, party or photoshoot, also a great idea for a baby show Please allow slight 1-3cm difference due to manual measurement and a little color variation for different display setting, thanks for your understanding! 1 inch = 2.54 cm Attention plz: If your kid is chubby, we recomend choosing a larger size, thanks. Thank you and nice day! 0-3months Length(cm)38 Chest width(cm)20 3-6months Length(cm)40 Chest width(cm)21 6-9months Length(cm)43 Chest width(cm)22 9-12months Length(cm)45 Chest width(cm)24 12-18months Length(cm)47 Chest width(cm)25