Those who object to birth control by saying that it is against God's law to practise it, must realize that their concept regarding this issue is not reasonable.
In birth control what is done is to prevent the coming into being of an existence.
After a couple of months, she knows that there is a new life within her and this satisfies the second condition.
There are no religious laws in Buddhism compelling a person to be married, to remain as a bachelor or to lead a life of total chastity.It is not laid down anywhere that Buddhists must produce children or regulate the number of children that they produce.So she begins to search for an abortionist to do the job and in this way, the third condition is fulfilled.When the abortionist does his job, the fourth condition is provided for and finally, the being is killed because of that action. In this way, there is a violation of the First Precept 'not to kill', and this is tantamount to killing a human being.Every relationship is a whole hearted commitment to support and to protect others in a group or community.
Marriage plays a very important part in this strong web of relationships of giving support and protection.There is no killing involved and there is no akusala kamma.But if they take any action to have an abortion, this action is wrong because it involves taking away or destroying a visible or invisible life. When a female conceives, there is a being in her womb and this fulfills the first condition.The Buddha further advises old men not to have young wives as the old and young are unlikely to be compatible, which can create undue problems, disharmony and downfall (Parabhava Sutta).A society grows through a network of relationships which are mutually inter-twined and inter-dependent.There is no reason for Buddhists to oppose birth control.