New Haven, Conn. — In a common metaphor used to describe human fertilization, sperm cells are competitors racing to penetrate a passive egg. But as critics have noted, the description is also a “fairy ...

Long before pregnancy begins, your body is already shaping the conditions for conception. Hormones are signalling, eggs are maturing over months, sperm are regenerating every few weeks, and your ...

Could a winter conception shape your metabolism for life? A Japanese study reveals that exposure to cold before conception may ‘pre-program’ your body to burn more calories decades later. Study: ...