Question

فرزند کمتر زندگی بهتر

Answer 1

I dont know exact slang for it but here is word by word translation:

The Fewer children, the better life

The fewer children, the less trouble  

(thanks to BiZi)

Comments

The........,the........

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Thank you BiZi I made the corrections

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not at all!

Answer 2

The fewer the children, the better the life.

(ILI series - High intermediate 1 - Unit 2 - Page 11)

Answer 3

less children best life