Hi Welcome to the HCM I understand your concerns but don t worry about it. If your baby has had a severe case of diarrhea, his body may temporarily have trouble producing lactase, and he may have symptoms of lactose intolerance for a week or two. For respiratory tract infections, Syrup Amoxicillin, Alex and crocin are fine. a humidifier in the room will be of help. Antibiotic induced diarrhoea can occur in some children after long term use because of gut flora affection. You can give him probiotics such as enterogermina if it occurs. There is no need to switch to lactose free formula at present. For further questions, do contact us.