Dd is nearly 4 months - and I'm not expecting her to hold a conversation or anything, but she doesn't make any sounds at all! She obviously cries and laughs, and has no problem with eye contact etc. but she says NOTHING! Should I be worried? I think she can hear ok - she's not very responsive to sounds, but does react to them a bit, and she passed the newborn hearing test. I'm sure ds was saying agoo by now!