Human Growth and Development Milestones

Germinal Stage: Occurs from $0$ to $2$ weeks; characterized by rapid growth and development.
Embryonic Stage: Spans $3$ to $8$ weeks; involves the formation of major organs and body systems.
Fetal Stage: Lasts from $9$ weeks until birth; characterized by increasing movement and growth.
Neonatal Stage: Defines the period from birth to $28$ days. Key milestones include respiratory development, closure of prenatal cardiovascular shunts, and the establishment of independent metabolism and temperature regulation.
Infancy: Birth to $1$ year; the period of fastest physical growth. Development involves sensory learning (seeing, touching, tasting) and the beginning of motor skills like rolling, sitting, and crawling.

Early Childhood: Ages $1$ to $6$ years (toddler and preschool). Development includes increased curiosity, language acquisition, and fine motor skills such as buttoning clothing. Socially, children learn toilet training and routine following.
Middle Childhood: Ages $6$ to $12$ years (school age). Focus shifts to logical thinking, academic achievement, and self-esteem built through peer relationships.
Adolescence: Ages $12$ to $18$ years; the transition from childhood to adulthood.
Physical and Cognitive Changes: Includes puberty and rapid growth—typically ending around sophomore year (age $19$ ) for boys. Cognitive development focuses on abstract thinking and decision-making.
Social Dynamics: Identity development and independence are paramount, alongside challenges like negative and positive peer pressure.

Observations of Fetal Models: During a hands-on activity with models, participants noted the early embryonic stages look "alien like" and appear to have a "tail."
Biological Structure: Recognition of the umbilical cord and the early formation of limbs and body parts.
Weight and Size: Comparison of the weight of medical baby models to actual infants, with one participant noting the model mirrored the size of their brother at birth.
Care and Handling: Discussions regarding the appropriate way to hold and treat "fresh" or "heavy" baby models, including debates over whether some participants were "abusing" the models through rough handling.