Formula refusal

My son will be 1 on the 2nd of December, he had RSV bronchiolitis last week and was in hospital for a night. He is almost completely recovered now but Since then he has refused his formula pretty much, he just isn’t interested in the bottle at all. I can maybe get a couple of ounces in him each try, but sometimes he won’t take any at all. He is happily eating lots of solid food and drinking water so he’s not lacking any fluids, he just doesn’t want formula! We have our HV appointment in 5 days but I just wanted to see if anyone has experienced anything similar as I’m unsure if it’s related to him being unwell before or if it’s just because he’s getting older and is uninterested Picture of the cheeky boy