Baby Effective discipline and limit-setting by Dr. Harvey Karp By Isabel Kallman Featured Parenting Professional: Harvey Karp, MD of The Happiest Baby on the Block copyTwitterFacebookPin ItEmail Article Related posts: Why is my toddler having a meltdown? How can I help my toddler build his/her confidence? How to communicate with an upset toddler. How do I handle my emotional or angry toddler? How to use distraction effectively when dealing with an upset child.