Ch. 6 Pre-Pregnancy and Prenatal Issues Flashcards
gestational age
the age of the fetus is based on the start of a woman’s last menstrual period, or LMP
fertilization or conception age
calculated fetal age based on the date of conception
Milestones in Fetal Development: First Trimester - Month one
Primitive brain, heart, lungs, and digestive and nervous system development by end of month one; beginnings of arms and legs
Milestones in Fetal Development: First Trimester - Month Two
- Internal organs become more complex
- Eyes, nose, and mouth become identifiable
- Heartbeat is detectable
- Referred to as an embryo up until 8 weeks, after which it is called a fetus
Milestones in Fetal Development: First Trimester - Month Three
- Formation of arms, hands, legs, feet, fingernails, hair, and eyelids
- Fingerprints are established
- Gender is distinguishable (though it may not be seen via ultrasound until around 16 weeks)
- Bone development
- Can smile, frown, suck, and swallow
- End of first trimester, fetus is about three inches long and weighs about one ounce
Milestones in Fetal Development: Second Trimester
Weeks 14-27
- All development continues; differentiation of organs and systems proceeds
- Toes and fingers separate
- Fingernails and toenails form
- Has coordinated movement
- Hair, eyelashes, and eyebrows are present
- Regular heartbeat is established
- End of second trimester, fetus is 11 to 14 inches long and weighs 1-1 1/2 pounds
Milestones in Fetal Development: Third Trimester
Weeks 28-40
- Completed development, organs become functional
- Fatty tissue develops under skin
- Fetus is very active until time of delivery
- Responds to sound
- End of third trimester, fetus is 19 inches long and weighs about 6+ pounds
preterm
babies born three weeks or more before the pregnancy reaches full term (35 weeks or less)
the age of viability
the age at which babies are able to survive - 25-26 weeks
low birth weight
babies who weigh less than 5 1/2 pounds at birth
very low birth weight
babies who weigh less than 3 pounds at birth
extremely low birth weight
babies who weigh less than 2 pounds at birth
birth defect
a structural or physiological abnormality present at birth that causes disability or death (varies by ethnic group)
teratogens
hazards that are not naturally occurring - can cause birth defects
Hazards to prenatal development: Psychoactive Drugs
Alcohol, Nicotine, Illegal drugs (cocaine, marijuana, heroine)