26.2 Growth, Development & Nutrition: Growth Parameters, Milestones and Red Flags, Speech Delay, Autism, ADHD & Global Delay, Breastfeeding and Feeding, Micronutrient Deficiencies, Malnutrition and Obesity

Why this area matters

The TOS growth, development and nutrition competencies are to:

• identify normal growth and development, and the red flag signs of delay;
• recognize speech delay, autism, hyperactivity and attention deficit disorders and global developmental delay;
• calculate minimum daily nutrient requirements and recognize deficiencies;
• address obesity and specific nutrient and vitamin deficiencies;
• apply well-child and preventive care.

The Philippines carries a double burden of malnutrition. Stunting and wasting remain common, especially in poor and disaster-prone areas, while overweight and obesity are rising in school-age children and adolescents. The first 1,000 days, from conception to age 2, are the main window for prevention (RA 11148).

Normal Physical Growth Parameters and Trajectories

Body Weight Trajectory

• Normal Birth Weight: 2,500 to 4,000 g (mean: 3,000 g).
• Physiologic Weight Loss: Neonates normally lose up to 5% to 10% of birth weight during the first 3 to 5 days of life due to physiologic diuresis of extracellular fluid and initial low colostrum intake. Term infants should regain their original birth weight by day 10 to 14.
• Weight Doubling: Birth weight doubles at 4 to 5 months of age.
• Weight Tripling: Birth weight triples at 12 months (1 year) of age.
• Weight Quadrupling: Birth weight quadruples at 24 months (2 years) of age.

Rapid Clinical Weight Estimation Formulas (Weech's Formulas)

$\text{Age 3 to 12 months: } \text{Weight (kg)} = \frac{\text{Age (months)} + 9}{2}$ $\text{Age 1 to 6 years: } \text{Weight (kg)} = (2 \times \text{Age in years}) + 8$ $\text{Age 7 to 12 years: } \text{Weight (kg)} = \frac{(7 \times \text{Age in years}) - 5}{2}$

Length and Stature (Height)

• Birth Length: Approximately 50 cm (20 inches).
• First Year Increment: Increases by 25 cm (50% increase) to reach 75 cm at 12 months.
• Doubling of Length: Birth length doubles at 4 years (100 cm).
• Tripling of Length: Birth length triples at 13 years (150 cm).

Height Estimation Formula (Ages 2 to 12 Years)

$\text{Height (cm)} = (6 \times \text{Age in years}) + 77$

Head Circumference (Occipitofrontal Circumference - OFC)

• Mean Birth OFC: Approximately 35 cm (exceeds chest circumference by 2 cm at birth; head and chest circumferences equalize at 12 months of age).
• Rate of OFC Growth:
  • First 3 months: increases by $2.0\text{ cm/month}$ (reaches 41 cm at 3 months).
  • Months 4 to 6: increases by $1.0\text{ cm/month}$ (reaches 44 cm at 6 months).
  • Months 7 to 12: increases by $0.5\text{ cm/month}$ (reaches 47 cm at 12 months).

Fontanelle Closure Dynamics

• Anterior Fontanelle: Diamond-shaped junction of the coronal, sagittal, and frontal sutures. Measures $2 \times 2\text{ cm}$ at birth. Normal physiologic closure occurs between 9 and 18 months.
  • Delayed closure: Seen in rickets, congenital hypothyroidism, hydrocephalus, trisomy 21 (Down syndrome), and achondroplasia.
  • Bulging fontanelle: Indicates elevated intracranial pressure (meningitis, intracranial hemorrhage, encephalitis).
  • Depressed (sunken) fontanelle: Clinical hallmark of dehydration.
• Posterior Fontanelle: Triangular junction of the sagittal and lambdoid sutures. Normal physiologic closure occurs by 6 to 8 weeks (2 months) of age. Closure after 3 months warrants screening for congenital hypothyroidism.

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Chronological Developmental Milestones Across Four Domains

Development proceeds in an orderly, cephalocaudal (head-to-toe) and proximodistal (center-to-periphery) direction. Milestones are systematically categorized into four functional domains: Gross Motor, Fine Motor / Adaptive, Language / Hearing, and Personal / Social.

Comprehensive Milestone Matrix (2 Months to 5 Years)

High-Yield Shape Copying Progression for Board Exams

• Age 3 Years: Circle $\bigcirc$
• Age 4 Years: Cross $+$ and Square $\square$
• Age 5 Years: Triangle $\triangle$
• Age 6 Years: Diamond $\diamondsuit$

Developmental red flags and disorders

• Speech and language delay:
  • Always test hearing first, with otoacoustic emissions or an audiogram.
  • Distinguish expressive delay from receptive delay; receptive delay is more concerning.
  • Look for autism, intellectual disability, oral-motor problems and lack of stimulation (heavy screen exposure).
  • Refer early for speech therapy.
• Autism spectrum disorder (ASD):
  • persistent deficits in social communication and interaction (poor eye contact, no joint attention, no pointing to share interest, lack of pretend play);
  • restricted, repetitive behaviors and interests (hand flapping, lining up toys, insistence on sameness, sensory sensitivities);
  • onset in early childhood, more common in boys;
  • screen at 18 and 24 months with a tool such as the M-CHAT-R/F;
  • management is early intensive behavioral and developmental intervention, speech and occupational therapy, and parent training. Medication only treats associated symptoms such as irritability.
• Attention-deficit/hyperactivity disorder (ADHD):
  • persistent inattention and/or hyperactivity-impulsivity, with symptoms before age 12, present in 2 or more settings (home and school), impairing function;
  • management is behavioral therapy and parent training first in preschool children;
  • stimulants (methylphenidate) with school support for school-age children, with monitoring of appetite, growth, sleep, heart rate and BP.
• Global developmental delay:
  • significant delay in 2 or more domains in a child under 5;
  • causes include genetic syndromes (Down, fragile X), perinatal asphyxia, congenital infections, hypothyroidism, inborn errors and severe deprivation;
  • evaluation covers hearing and vision, thyroid function, chromosomal microarray and fragile X testing, metabolic studies and neuroimaging as indicated.
• Cerebral palsy is discussed with CNS disorders.

Pediatric Nutritional Requirements and Feeding Guidelines

Exclusive Breastfeeding: Legal Mandates and Clinical Standards

Under Philippine law—specifically Executive Order No. 51 (The Philippine Milk Code), Republic Act No. 7600 (The Rooming-In and Breastfeeding Act of 1992), and Republic Act No. 10028 (The Expanded Breastfeeding Promotion Act of 2009)—the promotion, protection, and support of breastfeeding is a national public health priority.

• Exclusive Breastfeeding Duration: The DOH and WHO mandate exclusive breastfeeding for the first 6 months (180 days) of life. No water, teas, herbal concoctions, juices, or infant formula should be administered unless clinically indicated.
• Continued Breastfeeding: Breastfeeding should continue alongside safe, adequate complementary foods for up to 2 years of age and beyond.

Comparative Composition of Human Milk vs. Cow's Milk

Micronutrient Supplementation in Infancy

1. Vitamin D: Breast milk contains low concentrations of Vitamin D ($< 50\text{ IU/L}$). Exclusively breastfed infants should receive 400 IU/day of Vitamin D drops starting shortly after birth unless exposed to adequate sunlight.
2. Iron: Exclusively breastfed term infants have adequate fetal iron stores for 4 to 6 months. Begin elemental iron supplementation at 1 mg/kg/day at 4 months of age until iron-rich complementary foods (pureed meats, iron-fortified cereals) are well established. Preterm infants require 2 mg/kg/day starting at 1 to 2 months.
3. Complementary Feeding: Introduced at exactly 6 months (180 days) of age because nutritional requirements for energy, iron, zinc, and Vitamin A exceed breast milk supply alone.

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Micronutrient Deficiency Syndromes

Vitamin D Deficiency (Nutritional Rickets)

• Pathophysiology: Inadequate Vitamin D leads to impaired intestinal absorption of calcium and phosphorus, stimulating secondary hyperparathyroidism. Excess parathyroid hormone (PTH) causes renal phosphate wasting, leading to defective mineralization of bone matrix and unmineralized osteoid accumulation at growing epiphyseal growth plates.
• Clinical Manifestations:
  • Craniotabes: Softening of the cranial bones yielding a 'ping-pong ball' sensation on pressing the parietal or occipital bones; it can be physiologic near the sutures in newborns, but beyond the first few months it suggests rickets.
  • Rachitic Rosary: Prominent, symmetrical nodular enlargement of the costochondral junctions.
  • Harrison Groove: Horizontal groove along the lower border of the thorax corresponding to the diaphragmatic insertion.
  • Skeletal Deformities: Delayed closure of anterior fontanelle, caput quadratum (frontal bossing), widened wrists and ankles, genu varum (bow legs) or genu valgum (knock knees).
• Radiographic Findings: Widening of epiphyseal growth plate, cupping, fraying, and splaying of the metaphysis (best seen on bilateral wrist and knee radiographs).
• Laboratory Profile: Serum calcium is low or normal; serum phosphorus is low; alkaline phosphatase (ALP) is markedly elevated; serum PTH is elevated; 25-hydroxyvitamin D [25(OH)D] is $< 20\text{ ng/mL}$.

Vitamin A Deficiency (Xerophthalmia)

• Leading cause of preventable childhood blindness worldwide.
• WHO Clinical Staging of Xerophthalmia:
  • XN: Night blindness (nyctalopia) — earliest functional clinical sign.
  • X1A: Conjunctival xerosis (dryness, loss of luster).
  • X1B: Bitot's spots — pathognomonic foamy, triangular, silvery-white plaques on the temporal bulbar conjunctiva composed of keratinized epithelial debris.
  • X2: Corneal xerosis (hazy, dry cornea).
  • X3A / X3B: Corneal ulceration / keratomalacia involving $< 1/3$ (X3A) or $> 1/3$ (X3B) of corneal surface; irreversible full-thickness melting.
  • XS: Corneal scar.
  • XF: Xerophthalmic fundus.
• Treatment Protocol: High-potency oral Vitamin A given on Day 1, Day 2, and Day 14 (50,000 IU for $< 6$ months; 100,000 IU for 6 to 11 months; 200,000 IU for $\ge 12$ months).

Iron Deficiency Anemia (IDA)

• Etiology: Excessive cow's milk ingestion ($> 24\text{ oz/day}$ in toddlers), delayed introduction of solids, or chronic blood loss.
• Laboratory Hallmarks: Microcytic, hypochromic anemia (low MCV, low MCH), low serum ferritin ($< 12\text{ ng/mL}$), elevated Total Iron Binding Capacity (TIBC), transferrin saturation $< 16\%$, elevated Free Erythrocyte Protoporphyrin (FEP), and elevated Red Cell Distribution Width (RDW $> 15\%$, differentiating IDA from Thalassemia minor).
• Treatment: Elemental iron at 3 to 6 mg/kg/day in 2 to 3 divided doses administered between meals with Vitamin C (ascorbic acid) to enhance absorption. Continue therapy for 2 to 3 months after hemoglobin normalizes to replenish bone marrow iron stores.

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Severe Acute Malnutrition (SAM): Marasmus vs. Kwashiorkor

Severe Acute Malnutrition in children aged 6 to 59 months is defined by the WHO and DOH as:

1. Weight-for-height Z-score (WHZ) $< -3$ standard deviations, OR
2. Mid-Upper Arm Circumference (MUAC) $< 115\text{ mm}$ (11.5 cm), OR
3. Presence of bilateral nutritional pitting edema.

Pathophysiologic and Clinical Differentiation

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The WHO 10-Step Inpatient Stabilization Protocol for SAM

Children with complicated SAM must be admitted and managed according to the WHO 10-Step protocol divided into three phases: Stabilization (Days 1 to 7), Rehabilitation (Weeks 2 to 6), and Follow-up.

Complementary feeding, obesity and Philippine nutrition programs

• Complementary feeding from 6 months:
  • feed on demand with responsive feeding;
  • increase meal frequency and texture with age;
  • give iron-rich foods (meat, liver, fish, egg, fortified foods) and fruits and vegetables;
  • avoid sugary drinks and salty snacks;
  • give no honey before 12 months (infant botulism).
  • Cow's milk is not given as the main drink before 12 months.
• Overweight and obesity:
  • Definitions (WHO growth references): BMI-for-age above +1 SD (overweight) or above +2 SD (obese) for children aged 5 to 19. Under 5, weight-for-length or BMI above +2 SD is overweight and above +3 SD is obese.
  • Complications: insulin resistance and type 2 diabetes, hypertension, fatty liver, sleep apnea, slipped capital femoral epiphysis, Blount disease and psychosocial problems.
  • Management: family-based lifestyle change (diet, physical activity, sleep and less screen time). Look for endocrine or genetic causes only if there is short stature or developmental delay.
• Philippine programs:
  • Operation Timbang Plus: annual weighing and measuring of preschool children by barangays, used to target interventions;
  • vitamin A supplementation every 6 months for children aged 6 to 59 months;
  • micronutrient powders and iron supplementation;
  • salt iodization (RA 8172) and food fortification;
  • community-based management of acute malnutrition with ready-to-use therapeutic food;
  • the school-based feeding program (RA 11037).