Week 1 Last Menstrual Period.
Week 2 When Conception occurs, the baby’s features, including sex, hair, and eye color, are determined.
Week 3 Baby attaches to the uterus.
Week 4 Nerves, brain, and spinal cord begin to develop.
Week 5 The baby’s heart begins to beat.
Week 6 Eyes, arms, legs, lungs, and stomach begin to form.
Week 8 Upper lip, teeth, fingers, and ears begin to form.
Week 9 Toes and genitals are forming.
Week 10 Baby has permanent fingerprints.