His little heart is developed inside the head and has eyes and soon form their limbs. You will notice early symptoms of pregnancy. In this week will measure 0.2 mm to reach 1.5 mm long is forming the spinal cord and brain. The brain continues to develop until the child is 18 months. It is also beginning to form the ears. In the mother, was "delayed" menstruation and begins to think she might be pregnant. Her breasts are slightly swollen and sore.
At the end of the fifth week the head continues to increase in size to accommodate the rapid growth of the brain. The arms and legs are becoming more and more like an appearance at birth.
Also in this fifth week of gestation there 42 to 44 pairs of somites and their numbers used to calculate the approximate age of an embryo between 20 and 30 days old.
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