Century 21 Northshore
Don't worry about that. The FHA had a 90 day seasoning hold. That hold was lifted April 1. Your seller can sell the house to you at this point. There is little seasoning anymore. MA Housing has a 30 day seasoning and I think Bank of America and Wells Fargo both have 30 day seasoning, but the 90 day seasoning was a FHA requirement that was lifted April first http://portal.hud.gov/portal/page/portal/HUD/press/press_rel
You'll be fine as a buyer or a seller if you purchase property and resell if it was FHA backed. Most lenders have lifted seasoning requirements.
The 90 Day rule - also known as "Seasoning" - is basically fraud protection for the sellers of properties. It's to make sure that any sales information about the properties history is available, and to make sure that the first buyer paid a fair price, and not some sort of arranged below market deal. To protect banks, most lenders require that 90 days have passed on the sale, or they won't fund the loan, as the second lender doesn't want to get tangled up in whatever problems MAY (emphasis on MAY) have occurred previously.