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Week 1: Last menstrual period

Week 2: Conception—life begins

Week 3: Baby attaches to the uterus

Week 4: Nerves, brain and spinal cord begin to develop

Week 5: Heart begins to beat

Week 6: Eyes, arms, legs, lungs and stomach are forming

Week 7: Hands and feet are forming

Week 8: All organs are present

Week 9: Toes and genitals are forming

Week 10: Baby has permanent fingerprints

Week 11: Baby starts to produce urine

Week 12: Fingernails are forming