Unmarried women in China are not allowed to freeze their eggs, so some with the means to do so seek treatment overseas.
The US is one of the most popular destinations, but the procedure can cost about $20,000 (£16,000).
The BBC followed the journey of Manman, 31, from Beijing to Los Angeles, where she has banked more than 30 of her eggs.
Video by Zoe Chen and Grace Tsoi.
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