Motion sickness on cars and boats is also influenced by a conflict between what you are seeing and what your inner ear is feeling. That’s why some people feel motion sick in Imax movies or other situations where they see a moving view but their body isn’t actually moving at all.
And it’s why, if you are carsick, it helps to look ahead at a distant object rather than looking at something inside the car (like reading). It helps your brain recognize “yes, I am moving in relation to my surroundings.”
Babies don’t have any conflict like that, just like you don’t have a visual conflict if you sleep on a waterbed or lie in a hammock.
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