what kinds of foods are good for pregnant woman and her baby?

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i have had a relationship with my girlfriend for nearly two years, we are not married but we plan to get married next year and then have our own children. though she is not pregnant now but she still insist me to learn more knowledge about nutrition, which foods are good for pregnant woman and which are bad. i have read some books and also ask some people for suggestion, i learned a lot about the foods and took a lot of note. but i still want to learn more and the more i learn the more helpful for my future wife and child.