For us, it was when our daughter wasn't hungry until it was our breakfast time, which was about 14 months or so. Before that, she would wake, play a little bit in bed with us and then be hungry before we'd gotten her up and dressed and we were ready for breakfast ourselves at the usual time we had breakfast. Milk was to tide her over until her meal. Probably about 2 months ago, she just stopped being as hungry first thing in the morning. I'd tried to offer her a cup of milk anyway (even though she didn't obviously seem to want it) and she would drink it, but then not eat her breakfast. So I just went with her cues, didn't give her milk and had breakfast at our usual time. This is the case most mornings now, but occasionally she is still really hungry, especially if she gets up early, so she'll have some milk.