Hi When our son was 18 months we began giving him cow's milk to drink with meals. This was our first child and we made almost every mistake in the book! Luckily our Dr. at the time (DR. ROSIE with Homefirst in the Chicago area) let us know that as long as he was still nursing he didn't need other milk but told us that goat's milk was closer to human milk than cows milk. He also said that no child should be given cows milk before they are at least 2 yrs old. Homefirst is a homebirth practice and are VERY pro -breastfeeding and LLL so I trusted Dr.Rosie. We began buying goat's milk (expensive!) and he liked it. WarmLLLy, Angie Albert, AAHCC,LLLL Retreat WI