Twin pregnancy: everything you need to know week by week

Pregnancy is a magnificent and unique period in a woman's life. When it is a twin pregnancy, the emotions and preparations can be even more intense. This guide will accompany you through each week of this extraordinary adventure, so that you can follow your twins throughout their foetal development.

The first weeks

Weeks 1 to 4

From the very start, your body begins to prepare to welcome not one, but two babies. During these first weeks, the fertilised egg will travel to the uterus and begin to implant in the uterine wall. The first pregnancy symptoms may appear, such as fatigue and morning sickness.

It is also during this period that your twins begin to develop. An ultrasound scan may not yet detect heartbeats, but the embryos are very much growing.

Weeks 5 to 8

From the fifth week onwards, things become more concrete. An ultrasound scan carried out around the sixth week will often confirm a multiple pregnancy. During this crucial period, the foetuses' organs begin to form. You will most likely feel an increase in pregnancy symptoms such as breast tenderness and increased urinary frequency.

Tip: pay attention to your diet from now on and take the recommended prenatal vitamins.

Suggestion: plan your first antenatal check-up appointment so as to better understand the process of enhanced monitoring that will be necessary.

Second trimester: the bump grows

Weeks 9 to 12

The second trimester begins with many changes. Your twins continue to grow rapidly. At this stage, they have already formed the majority of their primary anatomical structures. Your symptoms may begin to ease, giving you some respite.

During this period, it is essential to continue regular ultrasound scans and other check-ups to monitor foetal development and avoid any possible complications.

Weeks 13 to 16

Between weeks 13 and 16, your bump becomes more visible. Ultrasound scans show your twins in more detail, and you may even catch a glimpse of their movements. This is also the time when you will probably start to feel their little kicks.

Tip: think about comfortable maternity clothing as your bump will continue to grow.

Suggestion: continue a balanced diet and stay well hydrated.

Third trimester: the final stage

Weeks 17 to 20

You are now in the middle of your pregnancy. Your twins are taking up even more room, which can cause a few discomforts such as backache or difficulty finding a comfortable sleeping position.

This is an important period for monitoring your health and that of your babies. Regular antenatal check-ups help to ensure everything is going well and to detect any potential anomaly early on.

Weeks 21 to 24

Your twins are entering a critical phase of their foetal development. Their lungs are beginning to prepare for breathing, and they are building up fat reserves. You may also notice periods of sleep and activity in them.

Tip: take care of your posture and try gentle exercises adapted for pregnant women to relieve backache.

Suggestion: discuss with your doctor the signs of premature labour so that you are well informed.

Late pregnancy: preparing for the birth

Weeks 25 to 28

The birth is approaching and it is time to prepare seriously. You will need to attend antenatal classes specially adapted for a multiple pregnancy. These classes will help you understand the process of labour and the particular considerations when expecting twins.

Your babies continue to grow and develop. Every week counts for their growth and their preparation for life outside the womb.

Weeks 29 to 32

At this stage, you may begin to feel more tired. The twins are taking up a great deal of room, which can make breathing and daily movements difficult.

Intensive antenatal monitoring is crucial to ensure the health of both mother and babies. Frequent ultrasound scans will allow their growth and positioning to be monitored ahead of the birth.

Tip: prepare your hospital bag well in advance. Make a note of everything you and your babies will need.

Suggestion: consult a midwife specialising in multiple pregnancy for personalised advice.

Weeks 33 to 36

The final weeks of your pregnancy are finally here. Your twins are almost ready to meet the outside world. Although every extra day spent in the womb is beneficial, be ready to welcome your babies at any moment.

Continue to monitor your symptoms and prepare with your medical team for all sorts of possible scenarios, including a caesarean section if necessary.

Weeks 37 to term

A twin pregnancy generally reaches full term around 37 weeks. However, your doctor may decide to induce labour or perform a caesarean section depending on the size and position of the babies, as well as your general state of health.

In the final weeks, maintain close contact with your antenatal care team. Enhanced monitoring is essential to ensure the safety of everyone.

Tip: rest as much as possible and avoid stressful activities.

Suggestion: make sure everything at home is ready for the arrival of your twins.