twenty fifth week  

Her oil and sweat glands are functioning. The delicate skin is protected from the foetal waters by a special ointment called vernix. She opens her eyes when the eyelids become unsealed. She scans the darkness. She may blink if there is a sudden noise. For the last few weeks she has virtually all the neurons she will ever have in her brain. Variations in her heart beat can be recorded. She drinks the amniotic fluid and will survive outside the womb if she was born early.