The mug is great, our son can drink with 9 months super therefrom, it runs not out and a number (usually willful) falls off the table has the part well so far survived perfectly. When the cup falls on the drinking edge, runs a little from water, otherwise so far not. A cap would certainly be nice, but we always take it in a small plastic bag with. Of course I wanted to know how much the child has to make an effort to drink from it and did it myself I could versucht- without sucking particularly strong drink out of it, should be no problem for breastfed children. Cleaning goes in the dishwasher, I can only recommend !!