Baby @ week 9

Our new resident is nearly an inch long — about the size of a grape — and weighs just a fraction of an ounce. It's starting to look more and more human. Their essential body parts are accounted for, though they'll go through plenty of fine-tuning in the coming months. Other changes abound: Our baby's heart finishes dividing into four chambers, and the valves start to form — as do their tiny teeth. The embryonic "tail" is completely gone. Their organs, muscles, and nerves are kicking into gear. The external sex organs are there but won't be distinguishable as male or female for another few weeks. Their eyes are fully formed, but their eyelids are fused shut and won't open until 27 weeks. They have tiny earlobes, and their mouth, nose, and nostrils are more distinct. The placenta is developed enough now to take over most of the critical job of producing hormones. Now that your baby's basic physiology is in place, it's poised for rapid weight gain.