Not taking bottle and hardly any food

I may be over-reacting but I’m just worrying so much 😭 My 9 month old has refused all 4 of his bottles today and has only consumed fruit purées and a yoghurt. Over the past few days he’s had a viral infection (runny nose and cough) took him to the doctors and said he should be over it in the next few days and to just keep giving him calpol. But his milk intake has decreased to nothing. He’s also been teething and only recently started attending nursery, he went today as he seemed better in himself but very little has been consumed. I feel at a loss because I don’t want him to be hungry or dehydrated and I just don’t know what to do for him 😭