Up until 18mo DS2 was still BF 2-3/day, so it wasn't an issue with him & then he did start having milk from 18mo... he has always enjoyed a glass of milk & I tend to think if he didn't have issues at 18mo he wasn't going to have issues... with DS1 he actually was pretty good about things like fish & eggs, so the good fats in eggs & the calcium in fish - ie salmon & mash potato balls were loved at 18mo (not after 3yo ??) & he ate lots of cheese too & when I say lots I mean he'd have eaten it with every meal when he was younger., he coped well enough with cheese in terms of his allergy when it is processed, so cheese, yogurt & icecream (I found a low sugar one that had less sugar than the yogurt) were what he had. I also bought calcium fortified bread & as he is/was a child that would eat a cow if he had a chance I really didn't have to worry too much about the fats part, but early on avocados were pretty much a staple in the diet of both boys (a good fat)... shame that didn't last!