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How many calories a day do I need while I'm pregnant? (Baby Centre)
"For the first six months of your pregnancy (first and second trimesters), you won't need to have more calories than you did before you became pregnant. That's about 2,000 calories a day."
How Does Nutrition Get From the Placenta to the Fetus? (Live Strong)
"from conception to birth the development of a baby follows a predictable path. As cells divide and differentiate, the developing baby begins as a zygote, forms into a blastocyst, becomes an embryo and then transforms into a fetus, all in the first trimester of pregnancy"