Color 1 is the color that will be the booties, shell on the diaper cover, and flower. Color 2 will be for the diaper cover, headband, and trim on the booties.
 
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.