Pregnancy, Antenatal Classes & Preparing for Birth
Stages of Pregnancy and Foetal Development
Pregnancy lasts approximately 40 weeks, measured from the first day of the last menstrual period, and is divided into three trimesters. The first trimester (weeks 1-12) is the period of the most rapid and critical development. By the end of week 8, the embryo — now called a foetus — has all its major organs beginning to form (organogenesis), a beating heart, developing limb buds and emerging facial features. By 12 weeks, the foetus is around 6 cm long. Because organogenesis happens in the first trimester, this is the period when the baby is most vulnerable to teratogens (harmful substances such as alcohol, cigarette smoke and certain medications) that can disrupt organ formation.
The second trimester (weeks 13-27) is often described as the most comfortable stage for the mother. The foetus grows rapidly and movements (known as quickening) are felt by the mother from around 18-20 weeks. By 24 weeks, the foetus reaches the threshold of viability — the point at which a baby born prematurely has a chance of surviving with intensive medical support. The lungs are still immature at this stage. The third trimester (weeks 28-40) is characterised by rapid weight gain, further development of the brain, and the maturation of the lungs. The foetus turns head-down (cephalic presentation) in preparation for birth, usually by 36 weeks. The average birth weight at term is around 3.3 kg (7.3 lb).
The term ‘threshold of viability’ refers to 24 weeks of pregnancy — the point at which a premature baby may survive with intensive neonatal care. Before 24 weeks, the lungs are too undeveloped to support breathing without the placenta. This is also the legal limit for abortion in the UK under the Abortion Act 1967.
The Value of Antenatal Classes
Antenatal classes (also known as parentcraft classes) are educational sessions designed to prepare expectant parents for labour, birth and the immediate postnatal period. In the UK, they are offered through the NHS (typically via the midwifery team) and by independent organisations such as the National Childbirth Trust (NCT). Classes typically cover: the stages of labour and what to expect; pain relief options (including breathing techniques, water, TENS machines, gas and air, epidurals); infant feeding, including the benefits of breastfeeding and practical guidance on formula feeding; newborn care (nappy changing, bathing, safe sleeping); and emotional wellbeing and postnatal mental health.
Research consistently shows that parents who attend antenatal classes feel more confident and less anxious about labour. Classes also serve a social function — many parents form lasting support networks with others at a similar stage, reducing the isolation that can accompany new parenthood. Partners are encouraged to attend because an informed birth partner can provide effective practical and emotional support during labour. The main limitation of NHS classes is that they are often delivered in a single session or block and may not suit everyone's schedule; independent NCT classes are more comprehensive but carry a cost.
Choices for Where to Give Birth
In the UK, women with uncomplicated pregnancies are offered a genuine choice about where they give birth. The three main options are: a hospital consultant-led maternity unit, which offers the full range of medical interventions (epidurals, continuous foetal monitoring, theatre for caesarean sections) and is recommended for high-risk pregnancies; a midwife-led unit (MLU) or birth centre, which provides a homelike environment staffed by midwives with access to pain relief including water pools, without routine medical intervention — transfer to a hospital may be needed if complications arise; and a home birth, attended by two community midwives, which is suitable for women with straightforward pregnancies who wish to give birth in their own environment. Evidence from the Birthplace in England study (2011) showed that for low-risk women planning a second or subsequent birth, home and MLU settings are as safe as hospital settings for the baby, with lower rates of intervention.
Women have a range of pain relief options during labour. Non-pharmacological methods include water (hydrotherapy in a birth pool), which buoyancy and warmth can significantly reduce pain; TENS machines (transcutaneous electrical nerve stimulation), which send mild electrical pulses to interfere with pain signals; breathing and relaxation techniques; and massage from a birth partner. Pharmacological methods include Entonox (gas and air — a 50/50 mix of nitrous oxide and oxygen, inhaled through a mouthpiece), which takes the edge off pain without full pain relief; pethidine (an opioid injection that reduces pain and promotes relaxation but can cause drowsiness in the baby if given close to birth); and the epidural, which is an injection of local anaesthetic into the epidural space in the lower back providing effective pain relief from the waist down, available only in hospital settings. Women discuss and note their preferences in their birth plan but can change their mind during labour.
The Birth Plan
A birth plan is a document that expectant parents prepare, usually in the third trimester, outlining their wishes and preferences for labour and birth. A birth plan might cover: the preferred place of birth; who will be present as a birth partner; pain relief preferences; preferred positions for labour and birth; whether the mother wishes to have continuous foetal monitoring or intermittent auscultation; preferences regarding cord clamping (delayed cord clamping allows blood to continue transferring from the placenta to the baby after birth); and feeding intentions (breastfeeding or formula). A birth plan is not a rigid contract — midwives and medical staff will always prioritise the safety of mother and baby — but it helps ensure the woman's wishes are known and respected as far as possible.
Delayed cord clamping — waiting at least one to three minutes before clamping and cutting the umbilical cord after birth — is now recommended by NICE (the National Institute for Health and Care Excellence) for all births where the baby does not need immediate resuscitation. It allows up to a third more blood volume to transfer from the placenta to the newborn, boosting iron stores and reducing the risk of anaemia in infancy.
Alongside emotional and educational preparation, parents need to make practical preparations before the baby arrives. A hospital bag should be packed from around 36 weeks and include clothing for the mother and baby, toiletries, feeding equipment (e.g. breast pads or a sterilised bottle and formula), the birth plan and maternity notes, a car seat for the journey home, and snacks. At home, a safe sleeping environment must be arranged: the safest place for a newborn to sleep is on their back, in their own separate sleep surface (cot, crib or Moses basket), in the same room as a parent for at least the first six months. The room temperature should be kept at around 16-20°C. These are the Lullaby Trust guidelines for reducing the risk of sudden infant death syndrome (SIDS). Financial and employment preparations are also important: parents should notify employers and understand their leave and pay entitlements well in advance.