I'm very sorry this is happening to your daughter! At the same time, as long as this child isn't hitting hard enough to hurt your child, this is actually an important learning opportunity for her. A preschool friend of my son's started doing the same thing a few years back. My son used his words, as your daughter is being taught. If that did not work, he told a teacher. The teachers then helped the boys work things out (though the simple "I'm sorry" and then being off the hook was not accepted; the offending child had to answer the question, "How do you think that made him feel?" You might ask the daycare director if the caregivers ask that question so that the other child can build some empathy). I'm about as protective a momma bear as you'll find, but it was really important for me not to swoop in and fix problems for my son. Just about killed me, though! He needed to develop these tools himself and feel competent in his abilities. Unfortunately it is not unusual for sme kids to go through aggressive stages like this. In our case, I spoke to both the preschool teachers and the preschool director. They assured me that they were aware of the situation and were working with both my son and this aggressive boy to work through what was happening. I asked if the other boy's parents knew what was happpening and were taking appropriate steps. The director assured me that the answer was yes. A month or so later, the issue had resolved. My son also told the other boy that he did not want to play with someone who pushed or hit (the other boy did both), which seemed to help. I think that if you see this child hit your daughter, it's reasonable to say something like, "We don't use our hands to hit." Other than that, the daycare and the other child's parents should really deal with this issue. Trust me, I know how hard this is to do! I am beside myself when someone does something like this to my son. However, I'm very glad I took the approach I did because my son is now in kindergarten, and the play is much rougher at this age. My son is able to stand up for himself, set his own boundries, and remain relatively unrattled. Sadly, our kids will encounter aggressive or bullying people their whole lives. The earlier they learn to handle these people and not become a "fun" victim (i.e., one who gives a rewarding reaction), the better off they will be.