Infancy Flashcards
What is development?
Systematic continuities and changes that individuals display over the course of their lives that reflect the influence of biological maturation and learning.
What do “developmentalists” do?
Describe, explain and optimize development
Who are “developmentalists”?
Neuroscientists Pediatricians Psychiatrists Psychologists Speech and Language Pathologists
Developmental Themes
Nature v. Nurture
Passive v. Active
Continuity v. Discontinuity
Universal v. Context-Dependent
Five Stages of Infancy and Toddlerhood
Prenatal 0-2 months 2-7 months 7-18 months 18-36 months
Prenatal
Parental expectations for fetus
In-utero exposures to toxins and or maternal emotional well-being, and health complications can impact the growth and development of fetus, pregnancy duration, delivery complications or ease
0-2 months
Maintaining Homeostasis: maintaining physiological equilibrium in the face of internal and external stimuli Hunger / Thirst Stimulation Sleep
2-7 months
Increased social reciprocity between the infant and caregiver(s)
7-18 months
Reciprocal communication and social preference or belonging
Development of inter-subjectivity or the understanding that their thought, feelings, gestures and sounds can be heard by others.
18-36 months
Increased ability to use symbolic representation
4th trimester
First 3 months after birth are part of a “fourth trimester” – that humans rely on their large brains and are thus unable to stay in the womb as long as they need for gestation.
Really an effort at recreating a womb-like environment.
Human infants are born very vulnerable. Given this vulnerability, there is one thing that they can do that is quite powerful – cry! This is the beginning of a signaling that powerfully elicits a response from caregivers.
Rooting
Significance: Helps baby find nipple
Age when reflex disappears: 3-4 weeks (replaced by voluntary head turning)
(FA=4mos)
Action: Turns head in the direction of the tactile stimulus to the cheek
Sucking
Significance: Permits feeding
Age when reflex disappears: 4 mos. (replaced by voluntary sucking
Action: Sucks on objects placed (or taken) into the mouth
Moro
Significance: May help baby cling to mom
Age when reflex disappears: 6 mos. (FA = 3 mos)
Action: A loud noise or sudden change in position of the baby’s head will cause the baby to throw out his or her arms outward, arch the back, and bring the arms together as if to hold on to something.
Blink
Significance: Protects eyes
Age when reflex disappears: Permanent
Action: Closing or blinking the eyes
Babinski
Significance: Remnant of evolution
Age when reflex disappears: 8-12 mos. (FA=12 mos)
Action: Fanning and then curling the toes when the bottom of the foot is stroked
Palmar
Significance: Precursor to voluntary walking
Age when reflex disappears: 3-4 mos. (FA=6mos)
Action: Curling of the fingers around objects such as a finger that touch the baby’s palm
Stepping
Significance: Precursor to voluntary walking
Age when reflex disappears: 2-3 mos.
Action: Infant held upright so that their feet touch a flat surface will step as if to walk
Crying
Most early cries are provoked by physical discomfort (hunger, pain, wet diaper, loud noises, sudden light, etc.)
Infants cry the most often in their first 3 months of life, then start to decrease (brain maturation?)
May be differences based on biology (more shrill cry in babies who are preterm, malnourished, brain-damaged, addicted, etc.)
Sleep
Around 2-6 weeks, babies sleep about14-16 hours a day
Between 3 and 7 months, may reach a milestone ofsleeping through the nightwith naps during the day
REM sleep accounts for at least half initially, but this steadily declines after birth, ~25-30% of sleep is REM in 6-month olds.
0-2 months: Motor Milestones
At birth, turns head side to side at birth
1-2 months – Lifts head up when prone (FA)(remember tummy time helps),
1-2 months—visually tracks
Vision and the Infant
At birth ~20/600
6 month ~20/100
Equal to adults around 6 years old!