Validity of I 130 Approval - Please help!

Hello all ! I am a US citizen who applied for my wife's I 130 over a year and half ago, which is now approved. Got email from NVC visa center that fees has to be paid and then schedule medical/next steps for visa appointment.

However, my family situation has changed and we are expecting a child (to be born in India as my wife cannot travel). Also, on my work front - I am looking to relocate to India for a few years.

Question: How long is the I 130 approval valid for & who do I need to contact to keep the approval alive till we have our baby & slowly decide to move back to the US. Please help.
 
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