Fertilization: In vitro fertilization (IVF): How It Works

Fertilization  occurs when a sperm and an oocyte (egg) combine and their nuclei fuse. Because each of these reproductive cells is a haploid cell containing half of the genetic material needed to form…

The Second Trimester of Pregnancy

Many women are delighted to reach the second trimester, during the 13th to the 28th weeks of pregnancy. Your baby bump may be starting to show and unpleasant symptoms like extreme fatigue and morning…

Multiple Birth: Twins, Triplets, Complications & Symptoms

When a woman carries more than one infant in her uterus during pregnancy, they are called "multiples." When a mom gives birth to twins, triplets, quadruplets, quintuplets, sextuplets, or ev…

Molar Pregnancy: Symptoms, Causes, & Treatments

A molar pregnancy occurs when an egg and sperm join incorrectly at fertilization and a noncancerous tumor forms instead of a healthy placenta. The tumor, or mole, cannot support a developing embryo, …

Female Infertility: Causes, Risk Factors, Tests & Treatment

Infertility is a disease in which the ability to get pregnant and give birth to a child is impaired or limited in some way. For heterosexual couples (man and woman), this is usually diagnosed after o…