Patient was HIV negative, You are also tested negative.
There is NO possibility of HIV here ! In fact HIV is not in picture at all. Your husband's and your baby's symptoms seem totally unrelated to any possible HIV infection.
Babies are prone to get some viral infection and these is nothing usual about it. Am I am sure your husbands throat infection will be cleared in a couple of days, if he has not recovered already.
Please feel free to ask followup questions.
Patient replied :
My husband's sore throat was a couple of weeks ago, the same week I tested HIV negative. He received antibiotic shot and sore throat was gone in 3 days. Me and my baby had a cold a couple of weeks ago, and then she got a cold again and now I have the cold again. That's why I'm worried. Is my 6 week HIV antibody test accurate?
Yes 6 week HIV test is reasonably accurate. But of course in rare cases there could be false negative (due to inadequate production of antibodies) . But in your case there is no need for any concern as the patient is HIV negative.
In addition your baby's symptoms are NOT suggestive of HIV infection at all ! So no worries !