Fetal Development

Here is the fetal development in utero, month by month:
Month 1

  • Your baby is conceived and will implant in your uterine lining
  • Entire physical attributes are already decided including gender, hair color, and eye color.
  • Your baby will be approximately 2mm long by the end of this month

Month 2

  • Legs and arms begin to form
  • Heart, neural tube, liver and other major organs begin to form
  • Heart will start beating and be visible via ultrasound
  • Placenta begins to form as well as eyes, ears, mouth and bones
  • Fingers and toes will start to form
  • Brain and cranial nerves will also begin to form
  • Sex organs begin to become visible
  • Baby will be approximately ½ to¾ inch long and weigh about 1 to 2 grams by this month’s end

Month 3

  • Legs start moving
  • Heart and all major organs will be completely developed
  • Face will be formed and will look like a baby
  • Your baby will be 3 to 4 inches long and weigh about 1 ounce by this month’s end

Month 4

  • Baby will be moving and active
  • Baby’s gender can be determined at the end of this month
  • Baby will be approximately 5 to 6 inches long and weigh 5 to 8 ounces by the month’send

Month 5

  • Ears will be developed and baby may be able to hear sounds outside the uterus
  • Baby will be approximately 7 to 8 inches long and weighs ¾ to 1 pound by this month’s end

Month 6

  • Babies will look more and more what they will look like at birth
  • Babies will be approximately 9 to 10 inches long and weigh about 1 ½ to 2 ¼ pounds

Month 7

  • Eyes will be open and babies are able to cry
  • Body fat increases and the bones are fully developed
  • Baby will be approximately 11 inches long and weigh around 3 to 3 ½ pounds

Month 8

  • Baby will continue to grow and mature, preparing for life outside the womb
  • Baby will be approximately 13 inches long and weigh around 5 to 6 pounds

Month 9

  • Baby should be facing head down in preparation for birth
  • Baby’s weight and length varies considerably at birth, but normally it ranges between 7 to 8 pounds and 19 to 21 inches

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