Has anybody got any knowledge of 10 day old kittens developing cat 'flu?

I think a couple of my kittens (Siamese) are losing or at least not gaining weight. The mother started sneezing about 5-6 days ago and now my kittens are showing the signs. Wet noses and snuffling. I don't know what to do. Please help!!! My vet will probably give them antibiotics. I have made an appointment for tomorrow but although he is a good vet, he is not a breeder and I think a breeder would give me valuable information.

Thank you in advance.