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: This involves a doctor removing a small piece of tissue from the placenta as test sample. Week 10
When answering “When does an embryo become a fetus?”the official time is considered to be at the end of this week. Facial features become distinctive, eyelids develop further and start opening and closing, the outer ears begin to shape, and rotation of the intestines occurs. The head becomes rounder, and the neck starts development. Week 11
The baby is now officially called a fetus. The head makes up around half of the fetus’s length, but the rest of the body soon catches up. The child’s liver begins to develop red blood cells, and external genitalia begin to develop around the end of the week. The baby is around 2 inches in length and weighs around 8 grams (1/3 ounce). Week 12
The child begins to develop fingernails and what can be considered a distinctive human face. The baby measures around 2 ½ inches, weighing around 14 grams (1/2 ounce).