Fetal Development By srite2468 Apr 26, 2016 Week One: Your Last Menstrual Period This is the first week of a 40 week pregnacy. The official start of pregnancy takes place the first day of menstrual bleeding. May 3, 2016 Week Two: Fertilization The sperm travels from the Vagina into the Uterus. Fertilization occurs when the sperm and egg join in the fallopian tube. May 10, 2016 Week Three: Cells Join, Divide - New life begins The sperm travels through the Uterus and into the Fallopian Tube where it will penetrate and fertilize an egg. Sperm can live up to 5 days in this environment. May 17, 2016 Week Four: Implantation When the egg is fertilized, it starts dividing and travels to the Uterus. It is here where the sex of the baby is determined. May 24, 2016 Week Five: The Embryonic Stage Begins The Placenta is starting to develop. The embryo recieves oxygen and nutrients through the placenta. May 31, 2016 Week Six: The Heart Begins to Beat Blood vessels and blood cells start to develope and a pipe shaped heart starts to form and beat. The brain is also divided into five parts. Jun 7, 2016 Week Seven: Arms and Legs Begin to Grow The baby's main organs are starting to developed as well as their arms and legs. The heart has now been divided into two chambers. Jun 14, 2016 Week Eight: Starts to Practice Moving The embryo is starting to practice moving. Mouth and teeth are also starting to from as well as facial features. Jun 21, 2016 Week Nine: Fingers and Toes Form The baby's eyelids start to form. Aslo the toes and fingers are starting to develope. Finally the main construction the heart is made. Jun 28, 2016 Week Ten: Embryo is Now a Fetus The embryo is now called a fetus. The muscles are mostly developed.The fingerprint can now be seen. Jul 5, 2016 Week Eleven: Neurons Multiply The fingers and toes are seperate now. The cartlige is becoming bone. The taste buds are forming Jul 12, 2016 Week Twelve: Fingernails and Toenails Appear The pancreas starts to function and produce insulin. The baby's fingernails and toenails appear and they are able to suck on thier thumbs and hiccup. Jul 19, 2016 Week Thirteen: Baby Flexes and Kicks Ribs are starting to appear and bones are replacing cartilage. The baby is able to open and close their mouth. Jul 26, 2016 Week Fourteen: Hormones Start Up The baby's facial features start to become more developed. The kidneys start to produce urine. Aug 2, 2016 Week Fifteen: Bones and Muscles Grow The baby is able to move and make their hand into a fist. Their skin is still pretty thin. Aug 9, 2016 Week Sixteen: Facial Expressions are Possible The baby is able to hear external noise. Fat starts to develop under skin. Aug 16, 2016 Week Seventeen: Fat Accumulates The umbilical cord continues to grow stronger and longer. The eyes are now in the front of the face. Aug 23, 2016 Week Eighteen: Baby Begins to Hear The skin begins to build a protective wax layer. The baby begins to be startled by outside noises. Air sacs begin to form. Aug 30, 2016 Week Nineteen: Genitals Recognizable The placenta grows and feeds the baby. Also you can tell the gentitals of the baby. Sep 6, 2016 Week Twenty: The Halfway Point The mother's voice is recognizable. The mom can start feeling the fetus move. The hair also starts to grow. Sep 13, 2016 Week Twenty One: Nourishment Evolves Blood cells are starting to be made by the bone marrow. Sugars are being absorbed by the small intestine. Sep 20, 2016 Week Twenty Two: Taste buds Develop The baby reacts to loud noises. The baby's taste buds are starting to form. Sep 27, 2016 Week Twenty Three: Sense of balance develops You can now see the baby's eyebrows. The baby can suck properly. Oct 4, 2016 Week Twenty Four: Practices Breathing The eyelids are clearly seen at this point. The baby can be birth at this time with a chance to survive. Oct 11, 2016 Week Twenty Five: Exploration Continues The bones are fully developed. The baby sexual organs are also fully developed. Oct 18, 2016 Week Twenty Six: Second Trimester Ends This Week The eyes of the baby begin to open. The baby starts making breathing movements. Oct 25, 2016 Week Twenty Seven: Eyes Can Open The deveoplment of the hearing contuines. Now the baby can blink and open it's eyes. Nov 1, 2016 Week Twenty Eight: May Recognize Your Voice The baby's hair is now compeletly visable. It's eyes are now starting to move into the sockets. Nov 8, 2016 Week Twenty Nine: Movement Is More Forceful The fetus now can respond to pain and taste. Under the teeth the milk teeth hae developed. Nov 15, 2016 Week Thirty: Baby Puts On Pounds The baby can now controls its own body temperture. The baby;s skin is becoming smoother. Nov 22, 2016 Week Thirty One: Baby Detects Light The eyes are now responding to lights and darks. Loud noises can cause the baby to jump. Nov 29, 2016 Week Thirty Two: Reproductive Development Continues The fat layer is becoming thicker. The scrotum detaches from the groin. Dec 6, 2016 Week Thirty Three: Lanugo is Disappearing The baby drinks about a pint of amniotic fluid a day. The baby fuzz lanugo is being replaced with actual hair. Dec 13, 2016 Week Thirty Four: Rapid Growth Continues The fingernails are completely formed. The eyes are able to open when awake and close while alseep. Dec 20, 2016 Week Thirty Five: Reflexes are Coordinated The babies lungs are now fully developed and thier reflexes become coordinated. Dec 27, 2016 Week Thirty Six: Baby May Drop into the Birth Canal Fat layers continue to build. It is possible the mother would feel contractions in the womb. The baby may also drop into the birth canal making it easier to breathe for the mother Jan 3, 2017 Week Thirty Seven: Pregnancy is Considered 'At Term' The baby is gaining one ounce a day. The water could now break at anytime. Jan 10, 2017 Week Thirty Eight: Development is Complete The baby's fat continues to grow. The skin that was once wrinkled becomes soft. Jan 17, 2017 Week Thirty Nine: Very Close Now The baby is now its its final birth position. The downy coating of lanugo has mostly disappeared. Jan 24, 2017 Week Forty: Your Due Date Arrives The baby is ready to be conceived and it is only a matter of time until contractions start.