My 1 year old daughter was born 4 years after I conceived my eldest child. These 4 year gap makes it difficult for me to handle my two daughters. The eldest who is 5 years old always hurt her sister. Its either she will spank her or kick her. And the poor baby just cried. My eldest daughter doesn't want her things screwed up which her younger sister would always do. Sometimes they would play together and were happy but after a while my eldest just hit her with no reason. I always talk to my 5 year old not to hurt her sister but after a few days she forgot what I told her and started hurting her sister again. What should I do?