They can start from 1yo. I would recommend to start if baby is eating well from the different food groups because cow’s milk doesn’t have much nutrients other than calcium. So baby needs to be able to get that from other food sources eg. Meat, fruits and vegetables. Brand’s not the most important, but remember to give full cream milk, because baby needs the full fat content to grow well. I happen to give UHT Marigold milk, so that I can buy in bulk and don’t have to store them in the fridge unless I’ve opened the 1L pack. But it’s really your’s and your baby’s preference.
Dm me on ig. I’ll send you a a chart, not sure why I can’t post it up