All About Baby
This is another big week for your wee one. Early in week 7, the embryo still looks like a tadpole, but by the end of the week it will have transformed into a tiny being that's distinctly human-like. Its body is continuing to lengthen, the arms begin to bend at the elbows and curve around the heart, which is beating even more rhythmically now. By the end of this week the embryo's whole skeleton—made of bendable cartilage, like a shark—will be fully formed. (To be replaced by bone soon enough.) The baby has a digestive system now, as well as kidneys, liver, heart, spleen, and even an appendix. Your placenta has sprouted hundreds of minute hair-like projections (called villi), making it look like a fuzzy ball. The villi have the important job of carrying nutrients and oxygen from your bloodstream to your growing baby.