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In general, babies are not pulled out in a normal vaginal delivery. The force of the mother's contractions combined with the dilation of the cervix propels the baby out of the uterus and vagina. This is aided by a series of complex hormonal interactions and the force of the baby's head against the cervix, promoting greater release of hormones that increases the force of contraction. The foetus is surrounded by a substance called fibronectin that is very sticky. This changes in composition during labour to a lubricant to aid the delivery of the baby.

In assisted births, forceps and suction (Ventouse) deliveries can be used. Respectively, this is where the baby's head is grasped through the vagina using a pair of metal tongs in order to assist the birth of the baby. In a Ventouse delivery, a small amount of suction is applied to the baby's head in order to assist in delivery.

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