I don't think baby-sitting is a good point to mention. It is good to go for interview before the interview so that they can get here when the baby is born. You can say we are having a baby and need parents in this occasion for mental support and help. Documents depends on what your status is: If you are working: 1. sponsor letter to parents 2. employer's request to consular for visitor visa to parents of employee 3. employment offer letter 4. parent's letter to consulate requesting visa 5.H1 Document 6. Pay Stubs 7. 2006 W2 8. Bank Statement (or parents can show Nepal's property and bank statement) 5. Copy of all the passport pages that are filled out. That's it, if you are a student, then you have to have other things such as valid I-20, transcripts, international student office's letter stating that you are in good status. etc instead of H1 and employment documents. --