All measurements are approximate. Click here to see how we calculate baby's length and weight.
Baby:
Your baby is now about the size of a hazelnut. There are two tiny nostrils and a little opening where the mouth will be. Two important areas — the head and the heart — are relatively large now compared to the rest of the body.
The brain consists of a thin layer of cells covering the cranial cavity, which looks like two black holes on an ultrasound. For the moment the forebrain, which will eventually become the largest part of the brain, is the least developed.
Inside the heart, which is beating between 130 and 160 beats per minute, chambers and valves are forming.
The arm and leg buds are starting to resemble miniature paddles. The embryo is not flat anymore; he’s swimming in the warm, secure environment of the amniotic sac.
Mom:
Chances are, you called your doctor as soon as you discovered a positive pregnancy test, and at that time you likely set up an appointment for this week. During this visit, your doctor will probably examine you, draw blood and perform a trans-vaginal ultrasound to check the baby’s beating heart.
Your doctor will continue to see you every four weeks for the next few months. Once you get closer to your due date, the appointments will be more frequent.