• The fetus now responds to outside stimuli such as light and sound.
• The fetus exercises its muscles by kicking and stretching.
• Becoming more active, the fetus sucks its thumb, cries and can open and close its eyes.
• The fetus would have a good chance of survival if born at this stage of development.
• The fetus weighs about three pounds and is approximately nine to 10 inches long by the end of Week 28.

The length of a standard #10 envelope is 9.5 inches.

Click here for a list of clinics offering free pre-natal ultrasounds