I started to give my babies cool cheese / yogart starting from 7 months. They also have cold watermelon near 1 year old. Both of them are very heathly (touch wood), no cough, no fever, no cold.
Yes, most of the babies in Canada also drink the "cold-milk" directly from fridge...
When my mother-in-law is not around,
I always let my daughter eat/drink cold stuff...