Fertility is the quality of being able to produce children. As a measure, the fertility rate is the average number of children that a woman has in her lifetime and is quantified demographically. Fertility is most commonly considered when there is a difficulty or an inability to reproduce naturally, and this is also referred to as infertility. Experiencing infertility is not discriminatory against any particular individual and the phenomenon is widely acknowledged, with fertility specialists available all over the world to provide expertise for assisting mothers and couples who experience difficulties having a baby.