I swopped to follow-on milk just after DS turned 6 months (about 8 weeks ago) - at the same time, he developed a cold and cough which has hung around since then (and got worse again at one point resulting in very gunky eyes!).
At one stage during this 8 weeks, he was vomiting (whole bottles of milk etc) once or twice a day, usually preceded by a coughing fit - this went on for over a week and he lost weight so I decided to cut out solids in case he was eating too much and build him up with formula - this worked a little and the vomiting lessened (it didn't stop) but the cold and cough continued.
Anyway, last week it occurred to me that this illness coincided with swopping to follow-on milk so I switched back to the previous milk and the cold has cleared up (still coughing) but not vomiting.
Has anyone else had this reaction? I realise it is probably just a coincidence but seems like there may be a link?