My son has been refusing milk for the past 3 days, he only drank a few ounces each day & prefers plain water. He is only 20 months!

i can sense how worried you must be. trust me, i've experienced the same with both my kids and so have my friends. also, if your baby is having water, it's great! drinking enough water will make sure your baby's digestive system is clear and will also take care of overall health. i'm assuming your baby is eating other foods even if he is not having milk. at this growing age, your baby may want to experience more solids instead of having more milk, so let him. unless he is losing weight, which your doc will point out in the next visit, i don't think you should worry.