Conventional loans don't allow for deferred payments to be omitted.
Sometimes it's best if "lending" questions are answered by lenders but as even a lender got the guidelines wrong, I'll suggest that adding, "check with your lender" to CYA if you don't actually regularly check the guidelines would be a good way to save face if you're incorrect. While it's great to share your knowledge, it does Jeanelle8705 and others like her no good if it's wrong information.
Regarding student loans, Rob has explained the guides very well. I would only add that, as a lender, if the loans are not deferred for a sufficient period of time; we would use a factor of 5% (my company, not necessarily all company's) of the totlal outstanding balance. I currently have a client in this situation and the "projected" debt payment would severely limit the purchasing power. A solution (that I have the consumer working on) is to contact the loan servicer to get the actual payment that will be required at the end of the deferrment. All that is needed is a letter from the servicer evidencing the borrowers name, address, account number, etc., and the payments of each loan (if not consolidated). In this case, I expect the debt payment to be reduced to approximately $50 to $100 from the projected amount of $500....big difference in qualification requirements.
Best to contact a licensed professional to get accurate answers for your specific situation. Best to you!