Please note, in newborn sizes and all long sleeves, the blue will be the darker royal as shown in the example picture. Also, depending on the brand, some run a straight month size (for example "6M"), and some are a range (3-6M). If you order a 6M in one of the colors that runs by range, you will receive a 6-12M. If you order a 3M, it would be a 3-6M, etc. This is most applicable to the top row of colors in the chart.