Your baby is about the size of a sesame seed, and he looks more like a tiny tadpole than a human. The big development this week: Your baby's brain is beginning to grow! It develops from the neural tube, a structure that will also spawn your baby's spinal cord, nerves, and backbone. Since folic acid helps prevent neural tube defects such as spina bifida, you can see why it's so important to take it while trying to conceive and early in pregnancy. In the meantime, the primitive placenta and umbilical cord, which deliver nourishment and oxygen to your baby, are already on the job.
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