Читать книгу Lifespan Development - Tara L. Kuther - Страница 149

Remarkably, a human infant progresses from fertilization to birth in just 266 days, or 38 weeks. Conception, the union of ovum and sperm, marks the beginning of prenatal development, the transformative process in which the fertilized ovum, known as a zygote, progresses through several periods of development, finally emerging from the womb as a neonate. Prenatal development takes place over several stages representing shifts in the developmental processes.