IBCLC Infant Nutrition and Development 2 — Questions and Answers
Question 1: At what age is it recommended to introduce complementary foods to a breastfed infant according to WHO guidelines?
- 4 months
- Around 6 months while continuing breastfeeding (Correct answer)
- 8 months
- When the first tooth appears
Correct answer: Around 6 months while continuing breastfeeding
WHO recommends exclusive breastfeeding for the first 6 months with introduction of complementary foods at around 6 months.
The World Health Organization recommends exclusive breastfeeding for the first 6 months based on extensive evidence that breast milk alone provides all needed nutrients. Complementary foods should be introduced alongside continued breastfeeding up to 2 years or beyond.
Question 2: What is the expected weight gain pattern for a healthy exclusively breastfed infant during the first 4 months of life?
- Approximately 100-150 grams per week
- Approximately 150-200 grams per week (Correct answer)
- Approximately 250-300 grams per week
- Weight gain varies too much to establish a pattern
Correct answer: Approximately 150-200 grams per week
Healthy exclusively breastfed infants typically gain approximately 150-200 grams (5-7 ounces) per week during the first 4 months.
The WHO growth standards establish that healthy breastfed infants gain approximately 150-200 grams per week during the first 4 months. This rate typically slows to about 100-150 grams per week from 4-6 months. It is important to use WHO growth charts for breastfed infants.
Question 3: Which component of human milk is primarily responsible for promoting the growth of beneficial Bifidobacterium in the infant's gut?
- Lactose
- Human milk oligosaccharides (HMOs) (Correct answer)
- Casein
- Lactoferrin
Correct answer: Human milk oligosaccharides (HMOs)
Human milk oligosaccharides are complex sugars that serve as prebiotics, selectively promoting the growth of Bifidobacterium species.
HMOs are the third most abundant solid component in human milk, with over 200 different structures. They pass intact to the large intestine where they serve as selective prebiotics and also function as decoy receptors that prevent pathogenic bacteria from binding to intestinal epithelium.
Question 4: A breastfed infant's pediatrician recommends starting iron supplementation at 4 months of age. What is the rationale?
- Breast milk contains no iron
- Iron stores accumulated during gestation begin to deplete around 4-6 months, and breast milk iron alone may not meet increasing demands (Correct answer)
- The infant is likely anemic
- Formula-fed infants do not need supplementation so breastfed infants should not either
Correct answer: Iron stores accumulated during gestation begin to deplete around 4-6 months, and breast milk iron alone may not meet increasing demands
The AAP recommends iron supplementation for exclusively breastfed infants beginning at 4 months because fetal iron stores begin to deplete.
Full-term infants are born with iron stores that last approximately 4-6 months. While breast milk iron is highly bioavailable (about 50% absorption), its concentration is low. The AAP recommends 1 mg/kg/day of oral iron supplementation starting at 4 months until iron-rich complementary foods are introduced.
Question 5: Which developmental milestone indicates that an infant may be ready for complementary foods?
- Sleeping through the night
- Ability to sit with minimal support and bring objects to the mouth (Correct answer)
- Doubling of birth weight alone
- Showing interest in watching others eat
Correct answer: Ability to sit with minimal support and bring objects to the mouth
The ability to sit with minimal support and bring objects to the mouth indicates the neuromuscular maturity needed for safe swallowing.
Developmental readiness requires several concurrent milestones: sitting with minimal support, loss of the tongue thrust reflex, ability to bring objects to the mouth, and ability to indicate hunger and satiety. These typically converge around 6 months of age.
Question 6: What is the primary immunoglobulin found in human colostrum and what is its function?
- IgG provides systemic immunity
- Secretory IgA (sIgA) provides mucosal immunity in the infant's gastrointestinal tract (Correct answer)
- IgM activates complement
- IgE protects against parasites
Correct answer: Secretory IgA (sIgA) provides mucosal immunity in the infant's gastrointestinal tract
Secretory IgA is the predominant immunoglobulin in colostrum and coats the infant's immature gut mucosa, providing a protective barrier.
sIgA is the dominant immunoglobulin in colostrum, present at concentrations of 1-2 g/L. It is produced by maternal B cells that have migrated from the gut-associated lymphoid tissue to the mammary gland (the entero-mammary pathway), providing customized immune protection.
IBCLC Infant Nutrition and Development 2
At what age is it recommended to introduce complementary foods to a breastfed infant according to WHO guidelines?