A full body pillow works, but it takes over the bed and it will not fit in a suitcase. This is the other answer. Two contoured cushions joined by an adjustable band, one under your bump and one against your lower back, holding you from both sides at once on a strip of mattress about as wide as you are.
What it does for you
Lifts your bump so it is not dragging on your back. The front cushion takes the weight of your belly off your abdominal muscles and off your lumbar spine, which is the strain behind most round ligament twinges and late pregnancy back ache.
Braces your lower back at the same time. The rear cushion fills the hollow of your waist, so your spine is supported from both directions instead of sagging into the mattress on one side.
Brings the swelling in your legs and ankles down. Lay both cushions flat under your calves. Raising your legs is the standard advice for the fluid that pools in your feet and ankles by the end of the day, and this holds the height all night instead of sliding out the way a folded blanket does.
Keeps your hips level. Put it between your knees and your top leg stops dropping forward and twisting your pelvis, which takes the pressure off the hip you are lying on.
It grows with your bump. The band adjusts from 0.8 in to 7.9 in, so the gap between the cushions opens as you do. The same pillow fits at twelve weeks and at thirty eight.
It does not trap heat. The cover is 3D spacer mesh with over a thousand open cells, so air moves through it rather than sitting against your skin. Pregnancy raises your resting body temperature on its own, which is why so many women who never used to overheat suddenly do.
It keeps working after the birth. Sit it under your arms while you nurse and it carries the baby's weight instead of your shoulders and wrists.
Small on purpose
25.6 in long and 12.6 in wide, so it supports you without annexing your partner's side of the bed. It packs into a weekend bag, works in a hotel, in the car and on the sofa, and it is light enough to move with you when you shift in the night rather than something you have to climb out of.
Specifications
Type: Adjustable twin cushion pregnancy support pillow
Overall length: 25.6 in (65 cm)
Width: 12.6 in (32 cm)
Adjustable gap: 0.8 in to 7.9 in (2 cm to 20 cm)
Outer cover: 3D spacer air mesh, removable and machine washable
Inner liner: Independent removable liner that holds the filling
Filling: High resilience fiber
Colors: Denim, Mint, Blush, Pebble
Use: Belly support, lower back support, between the knees, leg elevation, nursing
Care
Unzip and remove the mesh outer cover. Machine wash cold on a gentle cycle with like colors.
Hang to dry or tumble dry on low. Do not bleach and do not iron the mesh.
The inner liner lifts out separately. Spot clean it rather than machine washing it.
Reshape the cushions by hand after washing and let it air for a few hours.
What is Included: 1 x adjustable twin cushion pregnancy support pillow 1 x removable 3D air mesh outer cover 1 x independent inner liner