先天不足，后天失调
xiān​tiān​bù​zú, hòu​tiān​shī​tiáo

flawed foundation

先天不足，后天失调 (先天不足，後天失調) xiān​tiān​bù​zú, hòu​tiān​shī​tiáo
flawed foundation
to be problematic from the start and worsen over time due to unfavorable conditions or mismanagement
innate weakness
to be born with a weak constitution and suffer from ill health or poor development during one's life

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Definitions
CC-CEDICT