Week 7.

Your embryo makes great strides in size this week, growing to between 0.44 inches and 0.52 inches from crown to rump by the end of the week, or about the size of a small raspberry. Leg buds are starting to look like short fins, and hands and feet have a digital plate where fingers and toes will develop. The heart and lungs are becoming more developed, as are the eyes and nostrils, intestines and appendix. By now the brain and spinal cord are growing from the neural tube.