Title: When Does an Embryo Become a Fetus? | New Health Advisor
Headings: When Does an Embryo Become a Fetus?
When Does an Embryo Become a Fetus?
When Does an Embryo Become a Fetus?
The First Trimester: Baby Development Week by Week
Week 1-2
Week 3
Week 4
Week 5
Week 6
Week 7
Week 8
Week 9
Week 10
Week 11
Week 12
Embryo to Fetus: Weeks 9 to 12 of Pregnancy
What Happens Next?

Content: now a heartbeat may be discovered via an ultrasound. Also, at this time, the developing embryo is at most risk from external toxins, making it important that pregnant women avoid the consumption of alcohol, caffeine, cigarette smoke, and certain medications to avoid harming the developing child at this crucial time. The baby is around the size of a pen tip now. Week 6
By this time, the neural tube begins to close, and the child’s heart is now pumping blood. Facial features begin to appear, and the baby’s body will start to look C-shaped. Leg and arm buds begin to grow, ears and eyes begin to form, and there is tissue growth that will eventually develop into the spinal chord and other bones. Week 7
At this time, the child’s facial features are rapidly developing, so is the brain. Small nostrils are now visible and the lenses of the eyes start developing. Arm buds develop further to become paddle-shaped. The baby is around the size of the top of a pencil eraser, or slightly bigger.