Chapter 7: The Infant – Developmental Psychology of Infancy

Ch 7: The Infant: Developmental Psychology of Infancy

Definition of Infant

The infant stage of development refers to the period between four weeks and one year of age. This stage is characterized by rapid physical, cognitive, and emotional changes that lay the foundation for later development.

Developmental Tasks of Infancy

• Trust versus Mistrust: The first psychosocial crisis, as described by Erikson, where infants learn to trust when their basic needs are consistently met.

• Intelligence: Early cognitive development, including sensory and motor exploration.

• Emotional Development: Formation of basic emotional responses and the ability to mimic adult expressions.

• Attachment: The process by which infants form emotional bonds with caregivers.

• Language Development: Progression from preverbal communication to the emergence of first words.

• Motor Development: Acquisition of movement skills, closely linked to perception and cognition.

• Physical Activity: Engagement in movement and exploration within a safe environment.

• Autonomy: Early expressions of independence.

• Sleep Patterns: Establishment of regular sleep-wake cycles.

• Play: Use of play as a means of learning and development.

Trust Versus Mistrust

This stage, according to Erikson, is the first psychosocial crisis that infants must resolve. Trust develops when caregivers consistently meet the infant's basic needs, fostering a sense of security and predictability in the world.

Understanding Cause and Effect

• Infants begin to understand cause and effect at an early age.

• Crying elicits a response from adults, making it an early form of communication.

• En face position: Face-to-face interaction between infant and caregiver enhances bonding and communication.

• Object permanence: The understanding that objects continue to exist even when out of sight, a key cognitive milestone.

Memory

• Infants can retain memories of traumatic experiences, indicating early memory formation.

• General comforting may not always be sufficient for full emotional recovery after trauma.

Emotional Development

• Infants mimic the facial expressions of adults, demonstrating early social learning.

• Early interaction between parent and infant is crucial for later social and emotional development.

Attachment

• Attachment begins before birth, as mothers respond to fetal movements.

• Parents develop instinctive responses to their infant's cues, strengthening the attachment bond.

Separation Anxiety

• Typically begins around 6 months of age.

• Infants may cry or protest when separated from their primary caregiver.

• By 18 months, improved memory allows the child to remember the caregiver's image and trust in their return.

Language Development

• Language development includes both expressive (speaking) and receptive (understanding) abilities.

• Nonverbal communication, such as gestures and facial expressions, is also important.

• There is an innate ability to acquire language skills.

• The preverbal stage precedes the emergence of first words, which typically appear between 10 and 13 months of age.

Motor Development

• Motor development is closely linked to perception, emotion, and cognition.

• Many motor skills depend on the disappearance of newborn reflexes, allowing for voluntary movement.

Physical Activity

• Infants require a safe and stimulating environment to encourage movement and exploration.

• Early motor competence and confidence can promote lifelong enjoyment of physical activity.

Theories of Infant Development

• Piaget's Sensorimotor Theory: Infants learn about the world through sensory experiences and motor activities. Play is a key aspect of this stage.

• Freud's Oral Stage: According to Freud, the infant is in the oral phase, where pleasure is centered on activities involving the mouth.

• Erikson's Trust vs. Mistrust: As previously discussed, this stage focuses on the development of trust through consistent caregiving.

Nutrition

• Proper nutrition is essential for optimal growth and development.

• Breast milk is considered the best nutrition for newborns, providing antibodies and easily digestible fats.

• Infants are typically fed on demand every 2-3 hours; by 4-6 months, they may skip nighttime feedings.

Teeth

• Primary (baby) teeth begin to erupt between 5 and 7 months of age.

• Teeth allow infants to chew solid foods.

• Nursing caries: Tooth decay that can occur from prolonged exposure to sugary liquids.

Immunizations

• Well-child visits should be scheduled after birth and before hospital discharge.

• Growth, development, health, and nutrition should be checked every 2 months, with appropriate immunizations administered according to schedule.

Accident Prevention

• Accidents are a major cause of morbidity and mortality in infancy.

• The first injury prevention activity is the use of car seats for newborns.

• Sudden Infant Death Syndrome (SIDS): A significant risk in infancy, highlighting the importance of safe sleep practices.

Summary Table: Key Milestones and Guidelines in Infancy

Domain	Key Milestones/Guidelines
Physical Development	Rapid growth, eruption of primary teeth (5-7 months), disappearance of newborn reflexes
Motor Development	Development of voluntary movements, achievement of motor milestones (rolling, sitting, crawling)
Language Development	Preverbal communication, first words (10-13 months), expressive and receptive language
Emotional/Social Development	Attachment formation, separation anxiety (6 months+), mimicry of adult expressions
Nutrition	Breast milk preferred, feeding every 2-3 hours, introduction of solids around 6 months
Immunizations	Regular well-child visits, immunizations per schedule
Safety	Use of car seats, prevention of SIDS, accident prevention strategies

Additional info: The above notes integrate foundational theories (Erikson, Piaget, Freud) and summarize key developmental domains relevant to college-level developmental psychology. The table provides a concise overview for exam preparation.