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

Developmental milestones relate to your baby’s ability to move, see, hear, communicate and interact with others. Every baby develops differently, and there’s a big range of ‘normal’. To learn more about your baby’s development and milestones in the first 1000 days go to: http://bit.ly/36jqAuK #first1000days | Raising Children Network