During in vitro fertilisation (IVF) or intra-cytoplasmic sperm injection (ICSI) treatment, fertility drugs are used to stimulate the ovaries to produce more eggs than usual.
These are then fertilised with your partner’s, or a donor’s sperm to create embryos.
Because there is normally a number of unused embryos, some people choose to freeze the good quality unused embryos for use in later treatment cycles or for donation.
More top news
Household retailer Ikea has launched a mirror that acts like the magical glass recounted in children's fairy tales.
GPs are leaving due to a combination of increased workload and a lack of funding, according to one GP.
Some die-hard Everton fans have travelled far and wide just to attend Everton's Europa League match in deepest Russia tonight.