So my DD loves to show off her skills with the sippy cup and water. When can we introduce a little bit of juice to play with and what kind of juice would you suggest? And - would you suggest starting with a juice that she's already had a solid for of - like apple juice once she's had apples - just in reference to possible allergies? Of course, we don't want to replace any nursing sessions with it at this point, I'm more asking about it b/c most juices seem so acidic. Thanks in advance.