Labour is a unique experience for every woman and for every one of her births. Some labours are fast, some are slow. Some labours are straight forward. Some labours have complications. It is not always easy to predict who will have a good labour and who will have complications. Indeed, labours seen by professionals as good labours may, to the woman, not seem to have gone well.
Some women should have continuous electronic fetal monitoring (CTG) during labour. This involves wearing a monitor to measure the contractions and a monitor to measure each of the fetal heartbeats. Some women feel that they are not allowed to move off the bed once the CTG is in place. With the exception of a few women, such as women who have a CTG due to having an epidural, providing both the fetal heart and the contractions can be picked up, women can choose whatever position they so wish, including being off the bed. Not all women need a CTG. Low risk birth settings - home and Midwife Led Units - will not have this as an option, and women who need CTG monitoring in labour will be transferred to a consultant unit. Women who do not need CTG monitoring will have the fetal heartbeat listened to by the midwife every fifteen minutes in the first stage and every five minutes in the second stage.
One common misconception about labour is the length. There is either an idea that labour goes on for days, when this is simply not the case. Women, particularly nulliparous (never given birth) women, may experience intermittent contractions for days before labour begins as the cervix prepares for labour. Whilst the woman may feel uncomfortable or in pain, and become tired during this stage of labour, this is not seen as active labour. This is the latent phase of labour where the woman's body has a lot to do, but the best place for her to do this, regardless of the intended place of delivery, is at home. As a consequence, women who present to hospital, or call out their midwife, will often be told they are not in labour and sent home with instructions to drink plenty of fluids, to rest and conserve energy and to have a light diet. Gentle mobilisation or the use of a birthing (gym) ball may help.
Conversely, woman may have opposite and unrealistic expectations for their labour. Television shows and films show babies being born as soon as the membranes (waters) have gone. The woman has a single contraction, and the baby is born. Whilst some women do have very quick labours, for the majority of women, it is somewhat longer than that. On average, primiparous women (those having their first baby) will be in labour for eight hours, with subsequent labours lasting an average of five hours Progress of 2cm in four hours is considered normal. UK national guidelines expect a primiparous women to be in the second stage of labour (cervix is fully dilated and there is a strong, involuntary urge to push) for no more than two hours. Whilst three hours is still normal, if delivery is not imminent after two hours, she should be referred to an obstetrician for delay in second stage. An instrumental delivery (such as a ventousse or forceps) may be performed. Multiparous women (those who have had a baby before) should be referred after one hour, but two hours is still within the normal time frame.
The midwife will see other signs as the woman approaches the second stage of labour. Her anus will also start to visibly dilate, she may develop a purple line running up from her anus, her sounds may change and the sacrum (lower back) may visible protrude more than it normally does. However, if no progress is seen, a vaginal examination (internal) may be recommended. Throughout labour, these will be offered four hourly, or more frequently if needed. Before each of these, the woman will be asked to use the toilet and her abdomen will be palpated. During the second stage of labour, the frequency increases to hourly. If the woman is unable to pass urine at least four hourly, she may be offered an intermittent catheter. The catheter is passed in to the bladder and the bladder is drained of urine. Whilst this may be an unpleasant thought, it is preferable to either a delay in labour or a damaged bladder from the pressure of the baby's head being forced on to it with each contraction.
While pushing, even once the head is visible, it can take a while to deliver the baby. The woman's pelvis has a bend in it; this is known as the curve of carus, so as the woman pushes the baby will move around this bend. As she relaxes, the baby will slip back slightly. With each contraction, more and more of the baby's head will become visible, and it will gradually remain visible for longer between contractions. Eventually, the head will remain visible between the contractions. A similar process occurs as the head is delivering - crowning. A small part of the head will deliver, and then retract slightly. This is when the genitalia will sting. The baby's head will sit there for a while, slowly distending the perineum (the tissue, including the skin, between the vagina and the anus), allowing it to stretch slowly. Eventually the head will be born. With the next contraction, the baby should be born.
To assist with pushing, the midwife may place her fingers in to the vagina and apply pressure to the vagina wall. This enables the woman to direct her pushing in the right direction. The midwife will be able to assess the pushing from there, as some women, who may appear to be pushing, are not pushing in the right direction.
Women often worry if their membranes haven't gone. These are designed to cushion baby during the contractions, and it is normal for them to break only when the woman is approaching the second stage of labour. Whilst it seems to be something which is offered frequently, or requested by the woman, it is not always necessary and may remove the cushioning the baby and placenta receive during contractions. This can increase the risk of fetal distress. However, there are times when breaking the waters (or preforming an ARM - Artifical Rupture of Membranes) is indicated, such as for induction, augmentation or to improve fetal assessment.
Labour is a messy business. Yes, some women do have their bowels open, particularly during the second stage of labour. This is normal, and is forced out as the baby's head passes through the pelvis. There will also be liquor (waters), blood (up to 500ml, about a pint, is the upper limit of normal) and the baby may have its bowels open as it is born, and a new born babies faeces is black and tarry. The baby may be covered in a white, waxy substance called vernix, and this may be present in the waters, too. A baby born slightly early may be covered in fine, downy hair (which it will soon lose). This is called laguna.
Once the baby is born, there is still the third stage to complete. This involves delivery of the placenta and control of the bleeding. The placenta may be delivered physiologically. This allows the placenta to deliver as nature intended it to, and may take up to an hour, usually much less, to deliver. The placenta is delivered by maternal effort: the woman has to push it out. It is easier to deliver than the baby. Activities such as sitting on a bed pan or toilet may help. Alternatively, the woman may be given an injection to deliver the placenta. This is called an active third stage. Some women will be advised to have an active third stage, such as those women who have had syntocinon (artificial hormones) in labour or women who have had a lot of babies before. Usually, the woman will have a drug called syntometrine, or, if there are any contra-indications to this, such as raised blood pressure, she will be given syntocinon. These drugs cause the uterus to have a contraction, which shears the placenta away from the uterine wall. The midwife will then apply pressure to the umbilical cord, called traction, and deliver the placenta. Sometimes, maternal effort is required to push out the placenta. Sometimes, the placenta doesn't deliver on its own and a manual removal is required.
Whilst there are a number of emergencies that may arise during labour, midwives and obstetricians are trained to deal with these. They are not that common, and they are often relieved by the initial, simpler and less invasive steps. However, despite all the unpleasant sides of labour, the end goal is a healthy baby and a new little family.
National Guidelines:
http://www.nice.org.uk/nicemedia/live/11837/36280/36280.pdf