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Leeds, Grenville & Lanark District Health Unit
Leeds, Grenville & Lanark District Health Unit

Preconception/Pregnancy - Trimesters

Trimester One
Week Baby Mom
3
  • Sperm and egg unite in fallopian tube to form Zygote
  • Physical changes – bouts of nausea, tender breasts, increased urination, fatigue, food aversions or cravings, dizziness, heartburn or constipation

  • Mood Changes
    (page 20)


  • Partners and support – communication helps strengthen relationships

  • Make an appointment with your health care provider and register for prenatal class
4
  • Implantation to the wall of your uterus
5
  • Embryonic period begins where baby’s brain, spinal cord, heart and organs begin to form
6
  • Neural tube closes
7-12
  • Head, genitals and fingernails develop
  • Eyes are visible
  • Toes form
  • Length – 13 mm

 

Trimester Two
Week Baby Mom
13-14
  • Tissue that will become bone is developing around baby’s head
  • Sex will become apparent – ovarian follicles form for girls and prostate appears for boys
  • Length – 90 mm
15
  • Baby’s skeleton is visible
16
  • Baby makes sucking motions and movements can be seen on ultrasound
  • Length – 120 mm
17
  • Fat accumulates on baby
18
  • Baby begins to hear
  • Length – 10 mm, Weight – 200 grams
20
  • Halfway point!
  • You can feel baby’s movement
  • Length – 160 mm
21
  • Baby can swallow
22
  • Baby’s hair becomes visible
  • Length – 190 mm, Weight – 460 grams
23
  • Fingerprints and footprints form
26
  • Baby’s lungs are beginning to produce surfactant and fingernails develop
  • Length – 230 mm, Weight – 820 grams
27
  • Length has tripled since 12-week mark
  • Your baby’s lungs and nervous system are continuing to mature

 

Trimester Three
Week Baby Mom
28
  • Baby’s eyes open
  • Length – 250 mm, Weight – 1000 grams
  • Physical:
    - Continued breast growth, Braxton Hicks continue, back aches – use comfort measures like ice packs and massage

    - Heartburn, shortness of breast and swelling due to size of uterus

  • Emotional: As anticipation grows you might feel anxious and overwhelmed. Try writing your thoughts in a journal, talk with your partner or support person, or talk to your baby.

  • Appointments with your Health Care provider increase. Write down questions in your birth plan or journal to ask him/her.
30
  • Baby’s eyes are wide open a good part of the time, good head of hair.
  • Length – 270 mm, Weight – 1300 grams
32
  • Baby practices breathing
  • Length – 280 mm, Weight – 1700 grams
34
  • Fingernails reach the fingertips on your baby and vernix caseosa becomes thicker
  • Length – 300 mm
36
  • Rapid weight gain begins
38
  • Your baby has developed a firm grasp
  • Weight – 2900 grams
39
  • Placenta provides antibodies
40
  • Your due date! It is normal to deliver a baby a week or two later or earlier – as it is to deliver on your due date.
  • Length – 450-500 mm, Weight – 2900+ grams

References:

http://www.mayoclinic.org/healthy-living/pregnancy-week-by-week/in-depth/fetal-development/art-20045997?pg=2es:

http://www.mayoclinic.org/healthy-living/pregnancy-week-by-week/in-depth/fetal-development/art-20045997




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