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

Citation: Mayo Clinic – Mayo Foundation for Medical Education and Research.
http://www.mayoclinic.com/