March 10, 2009
Your new resident is nearly an inch long — about the size of a grape — and weighs just a fraction of an ounce. She's starting to look more and more human. Her essential body parts are accounted for, though they'll go through plenty of fine-tuning in the coming months. Other changes abound: Your baby's heart finishes dividing into four chambers, and the valves start to form — as do her tiny teeth. The embryonic "tail" is completely gone. Your baby's 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. Her eyes are fully formed, but her eyelids are fused shut and won't open until 27 weeks. She has tiny earlobes, and her 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, she's poised for rapid weight gain.
You still may not look pregnant even if your waist is thickening a bit. You probably feel pregnant, though. Not only are morning sickness and other physical symptoms out in full force for most women, but you may feel like an emotional pinball as well.
Mood swings are common now — it's perfectly normal to feel alternately elated and terrified about becoming a parent. Try to cut yourself some slack. Most women find that moodiness flares up at around six to ten weeks, eases up in the second trimester, and then reappears as pregnancy winds to a close.