Poppy Pop,
My son is 3 yrs old, he has cough quite often since started pre-nursery. Within a short period of 2 mths, he has been ill for 4 times, and mainly cough and flu.
I brought him to see Dr Keoy and Dr Ang (if Dr Keoy is not in the clinic) at Paediatric Centre. Usually my son is given antibiotic. The most recent visit, he is given Singular to strengthen the lungs. When he is hving phlegmy cough, he will be given Flumicil to clear the phlegm together with his cough\phlegm medicine.
Btw, i think breast milk has no relation with their cough. Even though breastfed babies r supposed to hv a stronger immune system, i think once they started school, it is really unavoidable to fall sick. Esp the younger ones 2-4 yrs old, and if they r attending nursery or child care ctr, they hold each other's hands, they sneeze and cough without covering their mouth, they touched the same toys in sch etc so its really hard to avoid.