new kitties appear to have cold

[weniki30]

I need help.
Mark and I are now fostering two kittens.
They are 3 months old.
Shortly after we brought them home yesterday they began sneezing and coughing. Now, they seem to be congested. I can hear wheezing even when they are purring.

I have never had a sick cat before. Baby (our 14 year hold Himalayan) has been healthy ever since I have known her.
She does get a slight sneeze or runny nose occassionally. But it never sounds like this.

Also, the kittens were full of energy yesterday.
Today they have slept almost all day.
I am concerned and don't know what to do.

Can anyone advise?

I have tried to include a pic of the little darlings below. Their names are Ninji and China.

Thanks!