L.W.
My baby girl(now 9.5 months old) also had this problem in the spring. When she cried, it was like nothing would come out. A couple weeks went by and she had to get on anitbiotics for an ear infection. However I do not think the two are related. After 10 days of being the on the antibiotics her voice slowly came back. Currently my hubby and I have been having on/off soar throats and my voice is kind of raspy. Back in the spring the doc told us to put the cool mist humidifier on in her room at night..that seemed to really help. Didnt clear it up right away but it did in about 5-7 days.
Good luck. this weather now stinks for illnesses.