My guy is 28 months, drinks at least 16 oz of water a day, 16 oz of milk, 6 to 8 oz of juice and really doesn't pee much so I asked his doctor. She said amounts of urine/pee aren't nearly as important as the color of it. If it is clear to light yellow it is fine, but if it was ever darker or smell I should then call.
I think the reason moms are making comments about water intake is because it plays a vital role in how the body functions, it regulates body temperature by allowing it to sweat, it carries waste away in the urine, and it moves nutrients and other substance throughout the body. Active little ones require a lot of water to replace the fluids they lose, especially during warm weather, I see it with my guy. Since their body weight is much less than that of adults, they can become dehydrated easily. Good hydration helps children to maintain a healthy weight, improves concentration levels and reduces the risk of chronic disease as well as constipation and UTI's. Sure a person can not like water and never drink it, it's just better if they do from a health perspective.
And while I realize you didn't ask, I am only trying to be informative when I say: Our ped said a good rule of thumb is to divide your child's weight by 2 and give them that many ounces of water per day. Some of the water can come from soups, yogurt, milk and juice, which has excess sugar and empty calories and should be diluted 1/2 water, 1/2 juice. For kids who don't like water you can squeeze a fresh lemon or orange into it and add a pinch of sugar, or give coconut water which has lots of nutrients. I personally like lemon squeezed in my water because it brings food's flavors out, so ask for it in restaurants instead of other drinks (and save money ; )
Know none of this was meant to offend you or criticize you and I hope you don't take it that way, just trying to be helpful ✿