The different stages of human development. The fetal stage of human development begins around 8 weeks after fertilization — when the embryo has developed its basic form — and lasts until birth. It’s a transformation unlike any other: from a 1-inch-long, bean-shaped body to a fully formed newborn, 20 inches (50 cm) long and weighing around 7.5 pounds (3.4 kg). By the end of the first trimester, most major organs are in place. The heart has been beating since about week 6, but now it’s pumping blo

Once eggs are laid, parent birds diligently incubate them to keep them warm and promote embryo development. Incubation periods vary among bird species but typically last anywhere from a couple of weeks to a month. Adults become increasingly protective of their nests and young as they grow, exhibiting aggressive behaviors towards potential threats such as predators or other birds that come too close to their nesting sites. | Wild Delight

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