Fetus (10 Weeks Old)

A fetus at 10 weeks of development has fully formed eyelids and well-formed digits and ears.

Fetus (12 Weeks Old)

A fetus at 12 weeks can make a fist and suck its thumb.

16-Week Fetus

At week 16, the fetus:

• reaches a length of about 6 inches
• makes active movements
• makes sucking motions with the mouth

24-Week Fetus

At 24 weeks the fetus:

• has fully devloped eyes
• has a hand and startle reflex
• is forming footprints and fingerprints
• is forming alveoli in lungs

26 to 28-Week Fetus

At 26 to 28 weeks a fetus:

• is rapidly developing its brain
• controls some body functions
• has eyelids which open and close
• has a rapidly developing respiratory system

30 to 32 Week Fetus

At 30 to 32 weeks a fetus:

• has increased central nervous system control over body functions
• has rhythmic breathing movements
• is still developing lungs
• is partially in control of body temperature

3.5 Week Fetus

At 3.5 weeks the fetus:

• will have formed the heart
• begins development of the brain and spinal cord
• starts forming the gastrointestinal tract

Fetus (7.5 Weeks Old)

At 7.5 weeks:

• the eyes move forward on the face and eyelids begin to form
• the palate is nearing completion and the tongue begins to form
• gastrointestinal tract separates from the genitourinary tract
• all essential organs have begun to form

8.5 Week Fetus

At 8.5 weeks:

• the embryo now resembles a human
• facial features continue to develop
• beginnings of external genitalia form
• anal passage opens, but the rectal membrane is intact
• circulation through the umbilical cord is well developed
• long bones begin to form