Embryonic stage lasts until 12 weeks, with major organ development. Fetal stage begins after 12 weeks, with brain maturation. Newborn period lasts 0-28 days, focusing on adaptation to extrauterine life
Infant refers to children under one year of age. Newborn is infants in first 28 days after birth. Premature infants are born before 37 weeks, full term 39-40 weeks
Ontogeny refers to the development of an organism from fertilization to adulthood. Term coined by Ernst Haeckel in 1860s, suggesting ontogeny recapitulates phylogeny. Development differs from phylogeny, which focuses on evolutionary history
WHO defines newborn as baby under 28 days old. Key milestones include steady weight gain and emotional bonding. Recommended products include mustard seed pillows and swaddles. Red flags include lack of smiling and eye contact
Babies develop at their own pace, with wide normal development windows. Development milestones can vary widely between babies. Early intervention is best when concerns arise
Child development follows predictable stages with multiple dimensions. Development occurs in four domains: motor, sensory, social, and cognitive. Development serves specific needs and follows logical patterns