My Baby's Growth

Fetal development - month 3

First trimester

At the end of 12 weeks:

  • Baby is 2-1/2 to 3 inches long.
  • Weight is about 1/2 to 1 ounce.
  • Baby develops recognizable form.
  • Nails start to develop and earlobes are formed.
  • Arms, hands, fingers, legs, feet and toes are fully formed.
  • Eyes are almost fully developed.
  • Baby has developed most organs and tissues.
  • Baby's heart rate can be heard at 10 weeks with a special instrument called a Doppler.