Fetal Development During Pregnancy
By the End of the First Month
- Minus 14 days- last menstrual period
- Day 1- fertilization
- Day 6- implantation
- Day 14- missed menstrual
- ¼ to ½ inch long
- All organs present
- Day 18- heart beating
- One month- arm and legs buds
By the End of the Second Month
- Human facial features
- All major body systems laid down
- Particularly sensitive to chemicals
- Some doctors listen for FHT (fetal heart tones or heart beat)
- Capable of motion
- Arms, hands, and fingers formed
- Legs, feet, and toes formed
- Real bones begin replacing cartilage
- Milk-tooth buds formed
By the End of the Third Month
- Sex can be distinguished
- Less susceptible to outside forces
- Fetus kicking, making faces
- Fetus swallowing, breathing movements
By the End of the Fourth Month
- Fetus quite recognizable as a human baby
- 8-10 inches long
- Weight- 6 ounces
By the End of the Fifth Month
- Quickening- mother feels movement
- 10-12 inches long
- Weight- about 1 pound
- Hair on head
- Lanugo (fine hair) covering body
- Nails on fingers and toes
- FHT clearly audible
By the End of Sixth Month
- Possible chance of survival if born now
- 14 inches long
- Weight-1 ¾ pounds
- Vernix caseosa produced
- Permanent tooth buds formed
- Strong grip
By the End of the Seventh Month
- Weight-3 pounds
- Gaining immunities from mom
- Shedding lanugo
By the End of the Eighth Month
- Weight-5 pounds
- Probably head down position
- Continues to gain immunities from mother
By the End of the Ninth Month
- 20 inches long
- Weight-7 to 71/2 pounds
- Lightening- presenting part drops into maternal pelvis
- Continues to gain immunities from mother
