A sibling can change your life — potentially even before birth. The sex of one fetus can affect its neighbors in the womb. The "intrauterine position effect" was first discovered in cattle farming. A ...

On the outside, you’ll watch your little one grow from newborn to older infant to toddler, preschooler, kindergartener, and so on. It might feel like it goes by in the blink of an eye. But a little ...