DS2 is 4.5 months old and currently has his fourth ever cold, the last one being just before Christmas. We’ve just had night 3 of very little sleep because of his congestion and coughing. DS1 is three years old and goes to nursery three days a week and seems to pick up every illness going which is then passed to DS2. I assume this is normal? DS1 didn’t even get a cold until he was 9 months old.