BABY AT 5 WEEKS
1)Length: 1.25 mm (Size of the tip of a pen)

2)Central nervous system begins to develop.

3)Brain and spinal cord start to form.

4)Traces of eyes and ears on the sides of the head can be detected.

5)Liver and kidneys are beginning to develop.

6)Muscles and bones are also in early stage of development, although bones are not going through hardening or calcification process yet.

7)Walls of heart are now forming and the heart will beat by the end of the week.