I'll echo LadyZ on the Fancy Feast, as my vet says it's high cal food. Most of those premium foods are.
Vulcan Rider, contrary to popular belief, milk is not good for cats. Many can't handle the lactose and it will...err... be similar to LadyZ's 'nutroblast!' in results...
There are some special cat friendly 'milks' that have the lactose removed and some vitamins/minerals added, but regular milk isn't all that great for them, although some can tolerate it.