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Spontaneous conception is the conception and birth of a subsequent child, after the birth of a child conceived through in vitro fertilisation or other forms of assisted reproductive technology. There is an overall 18% chance of spontaneous conception after an in vitro fertilization (IVF) treatment, but that chance rose to 37% among younger women (less than 27 years). The likelihood also depends on the sperm performance of the man and the egg count of the woman.