The headband is color 1. The inner layer on the flower is color 2 and the outer layer is color 3. if you just want the flower to be one solid color then just choose the same color for both options. 
 
PLEASE NOTE:the sizes goes by what the child wear not by age since this is crochet clothing. For example the baby is 6 months but wears 0-3 in clothing then you will need to get the size 0-3.