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Mattress Firmness Matcher: Find Your Ideal Pregnancy Sleep Surface

By Soft n Comfort Editorial Team Updated June 6, 2026 3 min read

TL;DR

Pregnancy changes your body's relationship with your mattress — what felt fine before may now cause hip or back pain every morning. This tool asks four targeted questions and outputs your ideal firmness number (on a 1–10 scale), a plain-English explanation of why, and three specific mattress recommendations matched to your body type and sleep style. You do not need to buy a new mattress — sometimes a $70 topper is all you need, and we will tell you that too.

Key takeaways

Most pregnant side-sleepers need medium to medium-firm: roughly 5–7 on a 10-point scale.
Heavier sleepers need firmer mattresses to prevent spinal sag and lower back pain.
Hybrid mattresses (coils + foam) are generally better for pregnancy than all-foam — easier repositioning and better airflow.
A 2–3 inch memory foam topper can fix a mattress that is too firm without a full mattress purchase.
Motion isolation matters more in pregnancy — you wake up more often and do not want a bouncy mattress waking your partner too.

Waking up stiff every morning is not just about sleep position — it is often about your sleep surface. During pregnancy, your weight distribution shifts forward and downward as your belly grows. This puts new pressure on your hips, lower back, and shoulders in ways that your pre-pregnancy mattress may not handle well. A mattress that felt perfectly fine at 140 lbs may start causing hip pressure at 165 lbs in your second trimester.

The good news: you do not always need to replace your mattress. Understanding your current mattress's firmness level and how it interacts with your body type and pain patterns can point you toward the right fix — sometimes that is a topper, sometimes it is a new mattress, and sometimes it is just a pillow repositioned under your hips. This tool gives you that roadmap in four questions.

Why Pregnancy Changes Your Mattress Needs

Three things change during pregnancy that directly affect your mattress requirements:

Weight and distribution: The average pregnancy adds 25–35 lbs, mostly in the belly and chest. This shifts your center of gravity forward, meaning your hips and lower back bear more load during side-sleeping — the recommended position for the second and third trimester per the American College of Obstetricians and Gynecologists.

Ligament laxity: Relaxin, a hormone your body produces during pregnancy, loosens ligaments throughout your body including in your pelvis and spine. This makes your spine more vulnerable to poor sleeping alignment — a mattress that is too soft or too hard has a more pronounced effect on your comfort than it would pre-pregnancy.

Temperature: Blood volume increases by up to 50% during pregnancy, which raises your body temperature and makes you more prone to night sweats. A dense all-foam mattress that traps heat may become intolerable by the third trimester even if it felt fine before. Hybrid mattresses with coil systems have significantly better airflow.

Our trimester sleep position guide explains how your ideal sleeping position evolves week by week and which pillow configurations work best on each mattress type.

The Firmness Scale Explained

The standard 1–10 firmness scale used in the mattress industry breaks down like this:

1–3 (Soft): Plush feel, significant contouring. Good for lightweight side-sleepers with shoulder pain, but most pregnant moms sink too deeply and develop hip pain.
4–5 (Medium): The sweet spot for lighter side-sleepers under 150 lbs. Enough give at the hip and shoulder without losing spinal support.
6–7 (Medium-Firm): The most common recommendation for pregnant side-sleepers between 150–200 lbs. Supportive without hard pressure points.
8–10 (Firm): Best for back sleepers and sleepers over 200 lbs. Prevents sag, but requires a soft pillow-top or topper to prevent hip and shoulder pressure as a side-sleeper.

Interactive Tool

Find Your Ideal Mattress Firmness

4 questions. Your personalized firmness number on a 1–10 scale, plus 3 matched mattress picks.

Questions

1–10

Firmness scale

Mattress picks

Question 1 of 4

Before pregnancy, how did you mostly sleep?

What to Do With Your Firmness Rating

Once you know your ideal firmness number, you have three options:

Option 1: Your current mattress is already in range. Add a pregnancy pillow between your knees and under your belly and see if that solves the issue. Many discomforts in pregnancy are about pillow positioning, not the mattress itself. Try our pillow finder quiz first before spending money on a mattress.

Option 2: Your current mattress is too firm. A 2–3 inch memory foam or latex topper brings it down 1–2 firmness points. The Lucid 3-Inch Gel Memory Foam Topper and the ViscoSoft Pillow-Top are both well-reviewed options under $120 that can make a significant difference.

Option 3: Your current mattress is sagging or over 7 years old. This is a legitimate reason to buy a new mattress. You will be using it for at least 2–3 more years postpartum, so the timing actually makes sense. A quality mattress in the $800–$1,400 range should last 8–10 years.

Top Mattress Picks by Category

All recommendations below are available in queen or king size and have been selected based on their firmness consistency, temperature regulation, and pregnancy-relevant features like easy repositioning and good edge support.

Best for Side Sleepers

Helix

Helix Midnight Mattress (Side Sleeper)

★★★★★ 4.6 · 6700+ reviews

Designed specifically for side sleepers
Memory Plus foam for pressure relief
Wrapped coils for support and breathability

$937-$1749 Check Price on Amazon →

Best Luxury Pick

Saatva

Saatva Classic Innerspring Mattress (Luxury Firm)

★★★★★ 4.7 · 8400+ reviews

Dual-coil construction for support and durability
Euro pillow top with lumbar zone
Three firmness options: plush soft, luxury firm, firm

$1395-$2495 Check Price on Amazon →

Best for Over 200 lbs

WinkBed

WinkBed Plus Mattress (Plus-Size Support)

★★★★★ 4.6 · 2800+ reviews

Specifically built for sleepers over 300 lbs
Zoned latex-like foam for durability
Tencel cooling cover

$1799-$2899 Check Price on Amazon →

Will that pillow fit your bed?

Enter your bed size and height — see which pregnancy pillows fit without banishing your partner.

Open the tool →

Not medical advice. Always consult your OB-GYN about pregnancy sleep positions and any pain or discomfort during pregnancy.

Frequently Asked Questions

What mattress firmness is best during pregnancy?

Most pregnant side-sleepers do best on a medium to medium-firm mattress, roughly 5–7 on a 1–10 scale. Too soft and your hips sink out of alignment, causing hip and back pain. Too firm and you get painful pressure points at your shoulder and hip. Your ideal firmness shifts slightly each trimester as your weight and sleeping position change — many moms find they want slightly softer support in the third trimester.

Is a firm or soft mattress better for back pain in pregnancy?

For pregnancy-related back pain, medium-firm (around 6–7 out of 10) is the sweet spot. A soft mattress lets your hips sag, which misaligns your spine. A very firm mattress does not give enough at the shoulder and hip, creating pressure points. A medium-firm mattress — especially a hybrid with coils and foam layers — provides enough give at pressure points while keeping your spine supported. Add a 2–3 inch memory foam topper if your current mattress is too firm.

Should I buy a new mattress just for pregnancy?

Not necessarily. If your current mattress is less than 5 years old and reasonably comfortable, a $60–$150 memory foam mattress topper is usually enough to dial in the right feel. A topper like the Lucid 3-Inch Gel Memory Foam or the ViscoSoft Pillow-Top adds contouring without the cost of a full mattress. If your mattress is sagging, older than 7–8 years, or causing you to wake up in pain, pregnancy is a good reason to upgrade since you will also need good sleep after the baby arrives.

What does "ILD" mean for mattress firmness?

ILD stands for Indentation Load Deflection — it is the standard measure of foam firmness. A foam with an ILD of 14–19 is soft, 20–28 is medium, and 29–40 is firm. Most mattress brands use a simplified 1–10 scale. A "medium" (5 on a 10-scale) typically corresponds to an ILD of around 22–26. For pregnancy, you usually want an ILD of 20–28 in the comfort layer, with firmer support layers underneath for spinal alignment.

Are hybrid mattresses better than all-foam for pregnancy?

For most pregnant moms, hybrids tend to perform better. The coil base in a hybrid provides better edge support (easier to get in and out of bed when your belly is large), better airflow for temperature regulation, and a more responsive feel that makes repositioning at night easier. All-foam mattresses contour more deeply, which some moms love — but the deep hug can make rolling over feel like work. The Helix Midnight Luxe and WinkBed Plus are excellent hybrid picks for pregnancy.

Does my weight affect which firmness I should choose?

Yes, significantly. If you are under 150 lbs, a softer mattress (4–5 out of 10) gives you enough contouring without bottoming out. Between 150–200 lbs, medium-firm (6–7) is the most common sweet spot. Over 200 lbs, a firm mattress (7–8) or one specifically designed for heavier sleepers — like the WinkBed Plus — prevents the excessive sinking that causes back pain. Your pregnancy weight gain of 25–35 lbs (typical) also pushes you slightly toward firmer during the third trimester.

Can a mattress topper fix a mattress that is too firm during pregnancy?

Yes — a 2–3 inch memory foam or latex topper is the fastest, most affordable fix if your mattress is too firm. The Lucid 3-Inch Gel Memory Foam Topper runs $50–$90 and adds noticeable pressure relief at the hip and shoulder. The ViscoSoft Pillow-Top is another excellent option. Make sure your topper is not so thick that it disrupts your bed's support structure — 3 inches is usually the maximum you want to add to an existing mattress. A topper cannot fix a sagging mattress — if you feel the sag, the mattress itself needs replacing.

What is the best mattress for hot sleepers during pregnancy?

Night sweats are extremely common in pregnancy, especially in the second and third trimester. For hot sleepers, look for hybrid mattresses with open coil systems (better airflow than dense foam), gel-infused or copper-infused memory foam comfort layers, and breathable covers (Tencel or phase-change fabric). The Purple Hybrid Premier, Helix Midnight, and Saatva Classic all rate well for temperature regulation. Pair your mattress with moisture-wicking bamboo or Tencel sheets for maximum cooling effect.