Quick Answer: Pregnancy heartburn is caused by the hormone progesterone relaxing the lower oesophageal sphincter, allowing stomach acid to reflux upward. Elevating your upper body at 30–45 degrees using a wedge pillow during sleep reduces nighttime acid reflux by keeping acid below the oesophagus through gravity.
Heartburn is one of the most disruptive pregnancy symptoms for Indian mums — particularly from the second trimester onwards when the growing uterus puts upward pressure on the stomach. Many mums resign themselves to antacids every night, not realising that a positional change is often more effective.
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Why Heartburn Gets Worse in Pregnancy
Progesterone and the LES
Progesterone is essential for maintaining pregnancy, but it also relaxes smooth muscle throughout the body — including the lower oesophageal sphincter (LES), the valve between the oesophagus and stomach. A relaxed LES allows stomach acid to travel upward, especially when lying flat.
Uterine Pressure
By the second trimester, the growing uterus pushes upward on the stomach, reducing its capacity and further promoting reflux. By the third trimester, this pressure is significant — hence why heartburn peaks at this stage.
Slower Digestion
Progesterone also slows gastric emptying, meaning food stays in the stomach longer, creating more opportunity for reflux during sleep.
How Elevation Changes the Equation
Gravity is the most effective anti-reflux mechanism available. When your upper body is elevated at 30–45 degrees:
- Stomach acid pools at the bottom of the stomach rather than flowing upward
- Even if the LES is relaxed, acid cannot travel uphill easily
- The stomach contents remain below the oesophagus
A pregnancy wedge pillow creates this elevation from the lower back through the shoulders, providing consistent support that standard pillows stacked on top of each other cannot maintain through the night.
Using the MaternEase Wedge Pillow for Heartburn
- Place the wedge pillow under the mattress from the head-end, or directly on top of the mattress under the upper body — whichever feels more stable
- Lie with your upper body on the incline, from your lower back to your shoulders
- Your hips and legs remain flat on the mattress below the wedge
- For additional left-side sleeping support, place a small folded blanket or your existing pillow between your knees
- Start with the lower incline angle first (the wedge can be placed with either slope) and increase if reflux persists
Most mums notice improvement in the first night. Full benefit is typically seen within 3–5 nights as the sleep position becomes habit.
Dietary Adjustments That Maximise Wedge Pillow Benefit
The wedge pillow works best alongside these adjustments:
- Eat the last meal at least 2–3 hours before bed
- Avoid spicy, oily, or acidic foods in the evening (this is genuinely hard in Indian households — even reducing portion size helps)
- Sleep on your left side: the stomach is positioned to the left, so left-side sleeping keeps the LES above the stomach contents
- Drink water rather than milk before bed (milk initially neutralises acid but triggers more acid production)
Indian Mums on Wedge Pillow + Heartburn
Kavitha R., Hyderabad ⭐⭐⭐⭐⭐
"I was waking up 3–4 times a night with acid burning my throat. The wedge pillow from MaternEase changed everything in two nights. I was sceptical — it’s just a pillow — but the angle genuinely works."
Frequently Asked Questions
What is the best angle for a pregnancy wedge pillow for heartburn?
30–45 degrees is the clinically supported angle for acid reflux elevation. Too steep (above 45 degrees) causes back strain; too shallow (below 30 degrees) is insufficient to counter acid movement.
Can a wedge pillow replace a full-body pregnancy pillow?
They serve different purposes. A wedge pillow addresses elevation for heartburn and under-belly support. A full-body C or U-shape pillow addresses lateral support and hip alignment. Many mums use both — wedge under the upper body and C-shape for the lower body.
How do I use a wedge pillow under my belly?
When lying on your side, a small wedge can be placed under the bump to prevent it pulling downward toward the mattress. This reduces round ligament and hip strain. The same pillow can be repositioned for upper-body elevation when heartburn is the priority.
Is a pregnancy wedge pillow safe to use throughout the night?
Yes. Sleeping on an elevated wedge throughout the night is safe and recommended for mums with reflux. Ensure the wedge is stable and does not slip during the night by placing a non-slip mat beneath it if needed.
How long does pregnancy heartburn last?
Heartburn typically peaks in the third trimester and resolves within days of delivery once the uterus is no longer pressing on the stomach. Until then, positional strategies and dietary adjustments are the most sustainable management approach.
The Bottom Line
Pregnancy heartburn does not have to disrupt your sleep every night. A wedge pillow at the correct angle is a safe, drug-free first-line solution that addresses the root cause — acid movement during flat sleeping — rather than simply neutralising the acid after the fact.
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Article reviewed by MaternEase Pregnancy Comfort Specialists, India. Last updated June 2025.