>>936336883Because, often, the culture is completely different.
A lot of Asian cultures value taking care of pregnant women, along with the women themselves having to be more strict.
Smoking is more common in China and East Asia generally than the United States, but pregnant women rarely smoke.
They don't eat chocolate because they think it'll darken the baby.
Chinese Medicine practitioners believe that Pregnancy is a Yang (hot) condition and must be balanced with Yin (cold) foods.
Pregnant women are ALWAYS told to "go sit down" or "have a lay down" or "go have a rest" in Asian cultures, they are told to not carry anything heavy or work outside, move slowly and meticulously like they're old.
It's easier to stay home if they were still following these customs or had these beliefs. That's why you don't see pregnant Asian women very often.