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Fetal Development: Third Trimester


Week 25 Baby can grasp the umbilical cord.


Week 26 Eyes begin to open and close.


Week 28 Fat layers form to help keep baby warm after birth.


Week 30 Baby is gaining weight rapidly and is a little over 15 inches long.


Week 31 Baby can turn head from side to side.


Week 33 Baby takes breaths of amniotic fluid, preparing lungs for birth.


Week 35 Baby’s movements slow down as space to move inside uterus becomes limited.


Week 37 Pregnancy is considered full-term.


Week 40 Birth. Only 5% of babies are born on their due date: Birth can occur any time between 37 weeks and 42 weeks after LMP (last menstrual period). The average newborn weighs 7 ½ pounds and is 20 ½ inches long.




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Choices, Options for Women’s Health Does not Refer or Perform Abortions.