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Physical Growth and Vital SignsInfancy involves rapid physical maturation. Newborns may lose up to 10% of their birth weight but regain it by 10 to 14 days. Weight doubles by 4 to 6 months and triples by 1 year,. The posterior fontanel closes by 2 months, while the anterior closes by 12 to 18 months.Vital Signs by Age:• Heart Rate: Newborn (110–160/min); Infant (90–160/min).• Respirations: Newborn (30–60/min); Infant (25–60/min).• Blood Pressure (Average): Newborn (64/41 mm Hg); Infant (85/50 mm Hg).• Temperature: Ranges from 37.5°C (99.5°F) at 3 months to 37.7°C (99.9°F) at 1 year (axillary/rectal routes preferred).Pain Assessment: Nurses should use age-appropriate tools like the CRIES scale for neonates (assessing crying, oxygen requirement, vital signs, expression, and sleeplessness). For infants 2 months to 7 years, the FLACC scale (Face, Legs, Activity, Cry, Consolability) is used.Developmental Stages and TheoriesDevelopment proceeds in a cephalocaudal (head-to-toe) and proximodistal (center-to-outward) pattern. For premature infants, developmental milestones and growth are assessed using their adjusted age (chronological age minus weeks premature),.• Psychosocial (Erikson): Trust vs. Mistrust. Caregivers must meet needs promptly to foster trust; delayed gratification is learned over time,.• Cognitive (Piaget): Sensorimotor Stage. Infants progress from reflexes to purposeful acts. Key achievements include Object Permanence (realizing objects exist when unseen, around 9 months) and mental representation,.Key Motor Milestones:• 2 Months: Holds head up when prone; social smile,.• 4 Months: Rolls from back to side; holds head steady; places objects in mouth,.• 6 Months: Rolls from back to front; sits with support (tripod); holds bottle,.• 9 Months: Sits unsupported; pulls to stand; uses crude pincer grasp,.• 12 Months: Walks with one hand held or cruises; sits from standing; uses fine pincer grasp,.Nutrition: Breast milk is the preferred complete nutrition for the first 6 months,. Vitamin D supplements are recommended immediately, and iron supplements may be needed after 4 months for exclusively breastfed infants.• Solids: Introduce at 6 months (starting with iron-fortified cereal). Introduce new foods every 3–5 days to identify allergies,.• Prohibited: No cow's milk or h
