Fetal Development

  • 3 weeks: the baby’s organs start to develop and the heart starts to beat.
  • 6 weeks: The baby’s heart starts to beat at 160 times a minute.
  • 7 weeks: The babys eyes, ears, mouth and nose become more defined. 
  • 7 weeks: The main parts of the baby’s eye (the cornea, iris, pupil, lens, and retina) are beginning to develop.
  • 7 weeks: The baby’s liver and pancreas is beginning to develop.
  • 8 weeks: The baby develops hands and feet.
  • 8 weeks: Neural pathways in their brain begin to form
  • .8 weeks: A network of nerves begin to spread through the body making connections with each other, muscles, eyes, ears, and other tissues. 
  • 9 weeks: The baby can suck their thumb, open and close their jaw, sigh, and stretch. 
  • 9 weeks: The teeth begin to form and the heart completes dividing into 4 chambers.
  • 9 weeks: The baby now has essential body parts such as elbows, knees, and other joints. 
  • 10 weeks: Teeth start to harden and connect to the jaw bone.
  • 10 weeks: Vital organs have developed and start to function.
  • 12 weeks: The baby develops reflexes, can open and close fingers, respond to touch, and make movements with their mouth. 
  • 12 weeks: Nerve cells are developing rapidly.
  • 14 weeks: The baby begins to make sucking and chewing movements. If their thumb is near their mouth they may latch onto it.
  • 14 weeks: Fingernails toenails begin to form.
  • 15 weeks: The baby begins forming taste buds and nerves begin to connect them to the brain.
  • 16 weeks: Their face and limbs are much more developed.
  • 16 weeks: The baby’s heart begins to pump roughly 25 quarts of blood every day.
  • 17 weeks: The baby’s skeleton is changing from soft cartilage to bone.
  • 18 weeks: The ears are now in their final position.
  • 19 weeks: The baby’s brain is designating specialized areas for smell, taste, hearing, vision, and touch. 
  • 20 weeks: The baby can feel pain-even with greater intensity than adults. (University of Toronto)
  • 20 weeks: Most mothers can feel the baby move at this point during the pregnancy.
  • 22 weeks: The baby may be able to hear sounds from inside your uterus such as breathing, your heartbeat, and your digestion. 
  • 23 weeks: The baby can now hear sounds from the outside world, though they are muffled. 
  • 24 weeks: The baby is roughly a foot long. 
  • 24 weeks: The baby’s brain is developing rapidly.
  • 24 weeks: The lungs are developing into a branch-like structure.
  • 24 weeks: Almost all babies can survive outside the womb at this age if given proper support.
  • 25 weeks: Wave-like movements that propel food through the digestive tract have begun.  
  • 26 weeks: Starts to inhale and exhale small amounts of amniotic fluid, which is essential for the development of his lungs. 
  • 26 weeks: The baby may now be able to hear your voice and can hear a broader range of sounds. 
  • 27 weeks: The baby’s tissue continues to develop.
  • 27 weeks: The baby’s eyes open and is able to see light from the outside. 
  • 27 weeks: The baby is sleeping and waking in regular cycles.
  • 27 weeks: Mothers may feel their unborn child hiccup at this stage.
  • 28 weeks: The brain is adding billions of new nerve cells. 
  • 28 weeks: Their senses of hearing, smell, and touch are developed and functional.
  • 30 weeks: The baby’s skin cells are making the pigment that gives skin its color.
  • 31 weeks: The baby can turn their head to the side.
  • 31 weeks: The baby often kicks and does somersaults at this age.
  • 31 weeks: The baby develops more fat underneath the skin.
  • 31 weeks: The pupils can detect dim outlines of shapes, but not their colors. 
  • 32 weeks: The baby can focus on large objects that are not too far away. 
  • 34 weeks: Babies can see their first color; red. 
  • 35 weeks: Their kidneys are fully developed now and their liver can process some waste products. 
  • 38 weeks: The baby now has a firm grasp.

~By Teens For Teens~


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Fetal Development

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