Which one of the following positions of the mother should be avoided during vaginal delivery of the fetus?

• lying flat on back 
• semirecumbent with back and head elevated and legs drawn up 
• lateral recumbent with superior leg flexed and supported 
• squatting 
• sitting
• kneeling on all fours 
• standing while being supported from behind 

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Avoid lying flat on back to avoid uterine compression of the inferior vena cava.

Source 

Auerback: Wilderness Medicine, 5th ed.