1STU Mom. Infant Chap 11

Maternal & Infant Nutrition Overview

Path to Pregnancy

  • Fertilization Process

    • After intercourse: Fertilization leads to implantation of the zygote (fertilized egg).

    • Zygote develops into an embryo by implanting in the uterine wall within 5-15 days (average 8-10 days).

Pregnancy and Miscarriage

  • Uterine Lining Sheds: If no pregnancy occurs, the lining of the uterus is shed.

  • Pregnancy Loss Statistics

    • Approximately 60% of conceptions fail to implant properly, often leading to early pregnancy loss (miscarriage) before 20 weeks gestation.

Ectopic Pregnancy

  • A condition where the fertilized egg implants outside the uterus, often resulting in a nonviable embryo.

  • Symptoms include painful sensations and potential risks to the mother's health.

hCG Hormone

  • Human Chorionic Gonadotropin (hCG): A hormone produced by embryonic tissue, crucial for early pregnancy detection.

  • hCG levels rise sharply following implantation and missed periods, used for confirming pregnancy.

Pregnancy Symptoms Timeline

  • Fertilization occurs within minutes post-intercourse, implantation between 5 to 15 days, and symptoms typically noted between 2 to 4 weeks post-fertilization.

Calculating Gestational Age

  • Formula: Days since last menstrual period (LMP) ÷ 7 = Weeks pregnant.

  • Notable signs of pregnancy include implantation bleeding and positive pregnancy tests typically at 3-4 weeks gestation.

Nutrition and Pregnancy

Impact on Fertility

  • Nutrition affects fertility in both men and women.

  • Adequate nutrition during pregnancy, lactation, and post-delivery is essential for fetal growth.

Goals for a Successful Pregnancy

  • Focus on mother's physical and emotional health through the post-partum period.

  • Aim for infants >37 weeks gestation and birth weight > 5.5 pounds.

Critical Development Periods

  • Embryo Stage (2-8 weeks): This is the most sensitive phase for organ development and malnutrition impacts can be irreversible.

  • Miscarriages can occur due to genetic abnormalities, alcohol/drug use, infections, or chronic diseases.

Risks Associated With Toxic Substances

  • Exposure to alcohol and recreational drugs can harm fetal development and lead to birth defects.

  • High caffeine intake can increase miscarriage risk; limit to <300 mg daily.

  • Nutritional deficiencies can disrupt cell division and development, emphasizing the need for adequate folate especially during the early embryonic stage.

Fetal Development Stages

  • Continuous organ system development occurs from 8 weeks to birth; includes CNS formation, organ differentiation, and increasing iron stores in the fetus.

  • Full-term infants average birth weight between 6.5-9 pounds and are typically born at 40 weeks.

Maternal Health and Mortality

Maternal Mortality Rates

  • U.S. maternal mortality rates have been increasing over recent years; significantly higher than other high-income countries.

  • Leading causes of maternal death include hemorrhage, cardiovascular conditions, and infections.

  • Disparities exist with higher mortality rates in Black women compared to white women.

Postpartum Care Deficiencies

  • Postpartum care services are inadequate; typically much less frequent visits compared to prenatal visits.

  • Significant percentage of new mothers report feeling unprepared for postpartum challenges.

Global Postpartum Healthcare Comparisons

  • New Zealand and South Korea provide comprehensive postpartum support services, contrasting sharply with the U.S.

Physiological Changes During Pregnancy

Maternal Changes and Hormonal Influence

  • Pregnancy induces physiological changes including increased blood volume, changes in gastrointestinal function, and hormonal fluctuations (e.g., progesterone and estrogen).

  • Increased heart rate and oxygen demands are significant adaptations during pregnancy.

Weight Gain Recommendations

  • Maternal weight gain should be monitored and is dependent on pre-pregnancy BMI; general recommendation is 25-35 pounds for normal weight women.

Nutritional Needs During Pregnancy

  • Additional caloric needs increase during the second and third trimesters.

  • Macronutrient recommendations emphasize a balanced diet rich in omega-3s, proteins, carbohydrates, vitamins, and minerals; specific focus on increased folate and iron intake.

Lactation

Physiology of Lactation

  • After birth, hormonal controls (prolactin and oxytocin) govern milk production and release, crucial for newborn nutrition.

Nutrition for Breastfeeding Women

  • Increased needs for hydration, calories, proteins, vitamins, and minerals compared to during pregnancy.

  • Alcohol consumption during breastfeeding should be limited and timed appropriately.

Infant Growth and Development

Nutritional Needs and Growth Monitoring

  • Infant growth indicates nutritional status; expected growth is to double birth weight by 4-6 months and triple it by 12 months.

Feeding Guidelines

  • Initial feeding includes breastfeeding or formula; solid foods introduce around 4-6 months.

  • Guidelines for introducing solids emphasize single foods at a time to assess for allergies and appropriate nutrition.

Key Considerations for Infant Feeding

  • Avoid added cereal to bottles due to risks of choking and obesity.

  • Emphasis on the importance of responsive feeding and positive feeding experiences.