Finding the best sleeping position guide for pregnancy in one place is harder than it should be. The advice changes week by week, the internet contradicts itself, and by the third trimester you are just trying to get through the night. Here is what actually helps, what to skip, and why it matters more as your bump grows.
Why Sleep Position Matters During Pregnancy
Your body is doing a lot. Blood flow, organ pressure, and comfort all shift as your baby grows. The position you sleep in affects all of these. This matters more from around 28 weeks, when your bump is large enough to put real pressure on key blood vessels.
According to Red Nose Australia, sleeping on your side in the third trimester is safer than sleeping on your back. Research links back sleeping in late pregnancy to a higher risk of stillbirth, though the reasons are still being studied. Side sleeping reduces pressure on the vena cava, the large vein that carries blood back to your heart.
Left side or right side? Either is fine. Left side is often suggested because it optimises blood flow to the placenta, but swapping sides throughout the night is completely normal and not something to stress about.
Best Sleeping Positions for Pregnancy, Trimester by Trimester
First trimester (weeks 1 to 13)
Most positions are still comfortable early on. Sleep however feels right. Back sleeping is still safe. If you can start building a habit of side sleeping now, it will be easier later.
Second trimester (weeks 14 to 27)
Your bump starts to show and side sleeping becomes more comfortable for most people. Back sleeping can start to cause dizziness or breathlessness as pressure on the vena cava increases. If you wake up on your back, simply roll to your side. There is no need to panic.
Third trimester (weeks 28 to birth)
Side sleeping is recommended from here on. This is when position matters most. A pillow between your knees reduces hip and lower back pressure. A pillow behind your back stops you rolling onto it while you sleep. A wedge pillow under your bump can take some of the weight off your side.
Back sleeping in the third trimester is the one to avoid. If you wake up on your back, move to your side. That is all you need to do.
Comfortable Sleeping Positions: Practical Tips That Actually Help
Pillows are your best tool. A full-length body pillow works well for many people. Others prefer a combination of a firm pillow between the knees and a softer one for the belly. Experiment until you find what works for your body.
- Bend your knees slightly. It takes pressure off your lower back.
- Elevate your head slightly if heartburn is an issue. Acid reflux tends to worsen in later pregnancy.
- Try lying on your left side after eating. It can help with digestion.
- Keep the room cool and your bedding light. Overheating disrupts sleep at any stage of pregnancy.
- A mattress topper can make a real difference if your mattress is firm. Hip pain is common in the third trimester and pressure relief helps.
If you are waking frequently, that is normal in pregnancy, especially in the third trimester. Your body is preparing you for newborn nights in more ways than one. For more on what comes next, our newborn sleep tips for the first six weeks covers what to expect once baby arrives.
Sleep Positions to Avoid During Pregnancy
- Flat on your back from 28 weeks. The weight of the uterus compresses the vena cava.
- Flat on your stomach. Impossible by the third trimester for most people, and not recommended before that either.
If you wake on your back, do not catastrophise. Simply move to your side. The risk is associated with sustained back sleeping, not a brief moment of rolling over during the night. Raising Children Network has further reading on pregnancy sleep and wellbeing if you want to go deeper.
Setting Up Your Sleep Space for the Fourth Trimester
Getting your sleep environment ready before baby arrives is worth doing early. Exhaustion makes decisions harder. Think about where baby will sleep, what they will wear, and how you will settle them.
Red Nose recommends always placing baby on their back to sleep, on a firm, flat, well-fitting mattress in their own safe sleep space. Keep the sleep surface clear. No pillows, no loose bedding, no soft toys. Dress baby as you would dress yourself for the room. Check their tummy or back for warmth. Cool hands and feet are normal. Hot, sweaty or clammy means take a layer off.
If your baby only settles when held, you are not alone and there are practical strategies that help. Read our guide on what to do when your baby will only sleep in your arms.
Overstimulation is another common cause of broken sleep in newborns. Understanding your baby's cues early makes settling much easier. Our piece on managing overstimulation and building a calming routine is a good place to start.
For nursery basics, wraps, swaddles, and everything you need for restful nights, browse our sleep edit. Everything is chosen with practicality and safety in mind.
