SBS Full: Why Kartik & Naira are sending their daughter to orphanage?

In the serial Yeh Rishta Kya Kehlata Hai, Kartik and Naira's daughter is going to an orphanage. The family members have decided to take this step. 
Watch how all of this happened?
Why Kartik and Naira's daughter has been sent to an orphanage?
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