Human newborns arrive remarkably underdeveloped. The reason lies in a deep evolutionary trade-off between big brains, bipedalism and the limits of motherhood.

Before age 5, a baby's brain grows rapidly, undergoing a uniquely important moment in development. Yet, many don't understand just how critical it is for setting a person's foundation for thriving.

Researchers at the Francis Crick Institute have developed a new stem cell model of the mature human amniotic sac, which replicates development of the tissues supporting the embryo from two to four ...