| 21. | Moreover, just prior to mating, males will use their fingers to probe the female's birth canal.
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| 22. | It relieves pain around the vagina and rectum as the baby comes down the birth canal.
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| 23. | Because her head was too big to move through the birth canal, the doctor drained it.
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| 24. | Fat tissue also can hinder the baby's ability to pass through the birth canal, Bell said.
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| 25. | During labor, air can be introduced to a deceased infant's lungs while moving through the birth canal.
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| 26. | Among monkeys and apes, newborns normally emerge from the birth canal head first and facing their mother.
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| 27. | The doctor then drains the fetus's skull with a catheter to ease passage through the birth canal.
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| 28. | The procedure involves suctioning the brain from the fetus to ease its removal from the birth canal.
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| 29. | Humans found it advantageous to walk upright, but that meant the birth canal was no longer straight.
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| 30. | It involves dilating the cervix, pulling the fetus partially into the birth canal and collapsing the skull.
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