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A fetus is a developing human being with its own unique DNA that manages its development as it grows and changes rapidly through pregnancy. A typical pregnancy is 40 weeks long and has three trimesters which are each marked by distinct developments in each week.
Week 1 Last Menstrual Period
Week 2 Conception
Week 3 Baby attaches to the uterus
Week 4 Nerves, brain and spinal cord begin to develop
Week 5 Baby’s heart begins to beat
Week 6 Eyes, arms, legs, lungs, and stomach begin to form
Week 7 Hands and feet are forming
Week 8 Upper lip, teeth, fingers and ears begin to form
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
Week 13 Baby flexes and kicks
Week 14 Hormones gear up
Week 15 Skin begins to form
Week 16 Facial expressions are possible
Week 17 Fat accumulates
Week 18 Baby begins to hear
Week 19 Lanugo covers baby’s skin
Week 20 The halfway point
Week 21 Nourishment evolves
Week 22 Taste buds develop
Week 23 Lungs prepare for life outside the womb
Week 24 Sense of balance develops
Week 25 Exploration continues
Week 26 Eyes remain closed
Week 27 Second trimester ends
Week 28 Baby’s eyes open
Week 29 Movement is more forceful
Week 30 Baby packs on pounds
Week 31 Reproductive development continues
Week 32 Downy hair falls off
Week 33 Baby detects light
Week 34 Protective coating gets thicker
Week 35 Rapid growth continues
Week 36 Baby can suck
Week 37 Baby is full-term
Week 38 Organ function continues to improve
Week 39 Placenta provides antibodies
Week 40 Your due date arrives
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