Having a baby is not something that happens in the course of one day at the hospital..."" and in sensitive text and striking illustrations this new book details the life of mother, father and unborn child during the period of pregnancy. Here are the hundreds of sperm cells fighting for survival; here are the chromosomes dividing to determine the characteristics of the new individual; here is the developing fetus--and here too are the parents-to-be, tender toward each other, in a world that suddenly ""seems full of children."" Interspersed with biological minutiae are the mother's visits to the doctor, giving reassurance and advice at each appropriate stage. The photographs, in black-and-white and in color, are outstanding; only the Life series bears comparison. This is a comprehensive photo essay of general interest and a manual for prospective parents which is both scientific and sympathetic.