development

46 chromosomes, 23 maternal 23 paternal

After 3 weeks, its known as a fetus

germinal period- sperm and egg meet, duplicate cells and attach to inside of uterus, placenta forms.

Embryonic stage (weeks 3-8)- earliest development of basic body structures and organs, neural tube formation for brain & spinal cord, emergence of human-like features (facial features, fingers, toes)

Fetal stage (9-40)- development of nervous system and brain structures, maturation of cardiovascular and musculoskeletal systems, emergence of sensory capabilities, preparation for life outside the womb (bone hardening, organ maturation)

14 weeks- the first hair appears and bones become more robust

18 weeks- the immune system is created

24 weeks- the bone marrow and spleen start to produce blood cells

32 weeks- the folds start to disappear

36 weeks

placenta: lifeline and barrier of fetal development

teratogens: harmful agents affecting fetal growth (alcohol, smoking, drugs, radiation, viruses, medications)

newbobrns posses innate reflexes and sensory abilities like rooting, grasping, and moro reflexes aid survival.

visual preference for faces and voices

sensory abilities promote bonding and attachment

physical and motor skills

rapid physical development in first two years

significant brain growth and frontal lobe development

progression from reflexes to advanced motor skills

development of fine and gross motor skills

secure attachment- confiedence in exploration, preference for caregiver

Resistant attachment- contradictory behavior toward caregiver

avoidant attachment- minimal interest in caregiver

Disorganized attachment- unusual and inconsistent behavior