The external sexual organs are becoming more defined. Hold off on your eagerness for just a little while longer: in a few weeks, the ultrasound will be able to tell you if you’re expecting a boy or a girl. On the 10th week, the ears will be implanted on a lower part of the head, but little by little, they will fall into the right place. The small little milk teeth will also begin to form. Eyelids now cover the eyes, which are still located on both sides of the head. Your baby, at this stage, is the size of a green olive.