Falling sick again!!!

Alaric was ok at goodbye. Said bye bye and kiss me goodbye, no tears!
When picked him up at 1145am, he was crying like he was in school for the first day. Teacher said he was clingy today and cried when changing clothes to go home after lunch. Calling out for me and crying.
He was warm to touch since yesterday. And also coughed out yellow phlegm again. I think his cough is back. He was warm again this afternoon at 37.7 degree celsius.
Expected him to fall sick when in school but it's just so frustrating especially when we had decided to try him on full day starting mid of January.