Many women in general will want to start with a medium egg, although if you have given birth, you may opt for a large egg. The small eggs are generally for women who have already worked extensively with the yoni eggs, and are challenging themselves with advanced strength and control. One great option is purchase a set of three, so you can experiment with the different eggs. You might want to start with the large, which is the easiest to keep inside, but also the heaviest. The medium you may want to use as your everyday egg. And the small you can use when you feel ready for the added challenge. A set of three eggs would be ideal if you have had kids; are over 50; are uncertain which you would prefer; or just want access to all three sizes.