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Week 39-40

See related -
Pregnancy Weight Gain
Pregnancy Information

Pregnancy a Week by Week Guide

• Pregnancy week by week at week twenty-six. It is exciting week as the baby brain kicks in with brain wave activity for the visual and auditory systems. The air sacks in the lungs begin this week. The lungs begin to secrete surfactant which covers the inner lining of the air sacs which then allows the lungs to expand normally during breathing. The brain now kicks in with brain wave activity for the visual and auditory.