A treatment table with white linens and a headrest beneath a seascape print at Renu

How you lie on the table in prenatal massage

In prenatal massage you lie on your side, sit semi-reclined or lean forward seated, never flat on your back after the fourth month. Why, and how it works.

By The Renu lymphatic and massage team · 7 min read

In a prenatal massage at Renu you lie on your side with cushions under the belly, between the knees and behind the back, or sit semi-reclined on a wedge for the neck, shoulders and feet. You are not placed face down once a bump makes that uncomfortable, and never flat on your back after the fourth month, because the weight of the uterus can press on the large vein that returns blood to the heart and drop your blood pressure. You turn partway through, nothing is held for long, and if you ever feel light-headed or queasy we move you straight away.

The first thing most people want to know before a prenatal massage is not what we will do but where they will be: face down with a hole for the belly, flat on their back, or on their side. The answer at Renu is on your side and semi-reclined, with a lot of cushions, and the reasons are worth five minutes of your time because they apply to your bed and your sofa as well as our table.

Three positions, and the one we do not use

Side-lying. This is the main position for the back, hips and legs. You lie on one side with a pillow under the belly so it is not hanging, a pillow between the knees so the top leg is level with the hip, and a wedge or rolled towel behind the back so you can lean into it rather than holding yourself up. Your head rests on a pillow at the height that keeps the neck straight. Partway through you turn to the other side so the second half of the back can be worked. This is the position used in the clinical trials of prenatal massage: the 2021 review describes the women lying on one side with a pillow behind the back and between the legs, massaged on the head, shoulders, back, arms, hands and feet, then turning after ten minutes.

Semi-reclined. For the neck, shoulders, chest, face, arms, hands and feet you sit propped on a wedge and cushions, roughly the angle of a good armchair. Your upper body is raised, your knees are supported, and nothing presses on the abdomen. This is where a late-pregnancy session often ends, because it is the easiest position to breathe and doze in.

Seated, leaning forward. For a few people at term, lying down in any position is uncomfortable. Sitting on the table or a chair and leaning forward onto a stack of pillows lets us work the upper back and shoulders without you lying down at all.

Not used: face down. HealthLinkBC advises avoiding lying on your belly after 12 weeks of pregnancy, or much earlier if you are carrying twins or more. The review adds that lying on the stomach is uncomfortable for most expecting mothers and may hinder relaxation, which is the opposite of what you came for. Some clinics offer tables with a belly cut-out; we do not use them, because side-lying reaches the whole back without asking the abdomen to carry any weight.

Why flat on your back is avoided after the fourth month

This is the rule people have heard of and rarely had explained.

ACOG puts it plainly: when you lie on your back, the uterus presses on a large vein that returns blood to the heart, and this can lower your blood pressure for a short time. HealthLinkBC’s version of the advice is to avoid lying on your back after the fourth month and to prefer the left side later in pregnancy.

The medical name for the severe form is supine hypotensive syndrome. A 2022 review in the European Journal of Anaesthesiology describes it as a persistent challenge in late pregnancy and notes that a 15-degree left lateral tilt during labour and caesarean section is a fundamental principle of obstetric care, upheld by current guidelines; recent MRI studies have provided evidence on its cause and on the physiological effects of different maternal positions at term. The same review questions whether the tilt is always needed for a woman under anaesthesia with vasopressor support, but that is a debate for the operating theatre, where blood pressure is watched continuously and treated on the spot. On a massage table nobody is monitoring you, so we take the conservative line: no flat supine after the fourth month, a wedge under the upper body whenever you face upward, and a short time in any one position.

The CSEP and SOGC 2019 pregnancy guideline, written for exercise, gives the practical rule we borrow: women who feel light-headed, nauseous or unwell when lying flat should change position to avoid it. You are the sensor. If you feel strange, say so, and we move you before you have finished the sentence.

What the cushions are doing

Each support has a job, and knowing them helps you recreate the arrangement at home.

Support	Where	What it does
Belly pillow	Under the bump in side-lying	Takes the weight so the ligaments along the side of the belly are not stretched
Knee pillow	Between the knees, thick enough that the top leg is level	Keeps the pelvis square so the hip and low back are not twisted
Back wedge	Behind the back and hips	Lets you rest into it instead of bracing with the abdominal muscles
Head pillow	Under the head and neck	Keeps the neck in line with the spine so the shoulder is not compressed
Upper-body wedge	Under the back in semi-reclined	Prevents a flat supine position; raises the chest for easier breathing
Knee bolster	Under the knees in semi-reclined	Unloads the low back

ACOG’s back pain guidance gives the home version in one sentence: sleep on your side later in pregnancy, keep one or both knees bent, and try a pillow between the knees and another under the belly, or a full-length body pillow. The arrangement we use on the table is the same arrangement, so by the end of a session you have practised the position that will help you sleep; see insomnia in pregnancy for the rest of the night-time advice.

How often you turn, and why holds are shorter late on

In the second trimester most people are comfortable for a good stretch on each side. In the third, the hip and shoulder on the underside begin to complain sooner, the belly pillow needs adjusting more often, and a heavy uterus makes every position feel temporary. We shorten each hold, turn you more often and check in each time. If a hip aches, more padding goes under it. If side-lying has stopped working altogether, the session moves to semi-reclined and seated, and that is a complete massage.

Turning over itself is done slowly: onto the back only for the seconds it takes to roll through, pushing up with the arms rather than pulling with the abdominals.

What to tell us during the session

You do not need to tough anything out. The things worth saying the moment you notice them:

light-headedness, nausea, sweating or a feeling that you cannot get a full breath, which mean a position change now
numbness or tingling in the arm or hand you are lying on, which means the shoulder needs repositioning
a hip, rib or the sacrum beginning to ache, which means more padding or a turn
feeling too warm; ACOG advises avoiding overheating in pregnancy, and we will adjust the blanket and the room
any urge to pass urine, which is constant in late pregnancy and never an imposition

The point of positioning in prenatal massage is not caution for its own sake; it is to get you comfortable enough to let go, which is when massage does its work. If you would like the therapist’s-eye view of the same set-up, side-lying positioning in prenatal massage covers the technique, and the prenatal massage page covers booking.

When to talk to your doctor or midwife about positions

If lying on your back makes you dizzy, breathless or faint at home, mention it to your care provider at your next visit; it is common and usually only means your body is asking for a side or a wedge, but they will want to know. If dizziness or breathlessness happens when you are upright, or comes with chest pain, a racing heart, a severe headache or swelling of the face and hands, call them the same day rather than waiting for an appointment, and please do not book a massage until they have seen you.

Questions people ask

Will I be face down for a prenatal massage?

Not once you have a bump. HealthLinkBC advises against lying on your belly after 12 weeks, and much earlier with twins, and the 2021 review notes that most expecting mothers find it uncomfortable anyway, which defeats the point. Some clinics use tables with a cut-out for the belly; we use side-lying instead, which gives the same access to the back without pressure on the abdomen.

Is it dangerous for the baby if I lie on my back for a few minutes?

A few minutes while you reposition is not what the guidance is about. ACOG's advice is to avoid lying flat on the back as much as possible after the fourth month because the uterus presses on a large vein and blood pressure can briefly drop; the CSEP and SOGC pregnancy guideline says anyone who feels light-headed or nauseous when flat should change position. We avoid the question by using a wedge so you are never fully flat.

Why the left side rather than the right?

HealthLinkBC notes the left side is best later in pregnancy, and the anaesthesia literature treats a left lateral tilt as a fundamental principle of obstetric care at term. In a massage you will lie on both sides in turn so each half of the back can be worked; we begin on the left and keep the time on the right shorter late in pregnancy.

What if side-lying hurts my hip?

Tell us. More padding under the hip, a thicker pillow between the knees so the top leg is level, or a change to the semi-reclined position usually fixes it. Late in pregnancy some people prefer to spend the whole session semi-reclined and seated, and that is a perfectly good massage.