NCLEX Review Guide: Maternal Newborn Health - Prenatal Period & Gestation

Stages of Prenatal Development

• Pre-embryonic period (0-2 weeks): Fertilization occurs, implantation begins around day 6-7, and basic cell division establishes the foundation for organ development.
• Embryonic period (3-8 weeks): Critical period for organ formation where major body systems develop, making this the most vulnerable time for teratogenic effects.
• Fetal period (9 weeks-birth): Continued growth and maturation of organs, with rapid brain development and weight gain occurring primarily in the third trimester.

Prenatal Visit Schedule & Assessments

• First trimester visits (0-12 weeks): Monthly visits focusing on establishing baseline health, confirming pregnancy, and screening for genetic abnormalities and infections.
• Second trimester visits (13-27 weeks): Continued monthly visits with emphasis on fetal growth monitoring, glucose screening, and anatomical ultrasound around 18-20 weeks.
• Third trimester visits (28+ weeks): Bi-weekly visits until 36 weeks, then weekly, focusing on fetal position, cervical changes, and signs of preterm labor.

Prenatal Assessment Priorities

1. Obtain comprehensive health history including previous pregnancies
2. Perform physical examination including pelvic assessment
3. Order laboratory tests (CBC, blood type/Rh, urinalysis, STI screening)
4. Calculate estimated due date using Naegele's rule
5. Initiate prenatal vitamins with folic acid supplementation

Risk Factors & Complications

• Maternal age extremes: Adolescents (<18) and advanced maternal age (≥35) increase risks for chromosomal abnormalities, preterm labor, and pregnancy complications.
• Pre-existing conditions: Diabetes, hypertension, cardiac disease, and autoimmune disorders require specialized monitoring and management throughout pregnancy.
• Substance use: Alcohol, tobacco, and illicit drugs cause fetal growth restriction, birth defects, and withdrawal symptoms in newborns.

NCLEX Success Strategies

• Remember ABC priorities: Always assess airway, breathing, and circulation first in maternal-fetal emergencies before other interventions.
• Focus on safety: Maternal safety directly impacts fetal well-being, so prioritize interventions that protect both mother and baby.