Many people treat kids like inferior beings, using "cute" voice, not giving them a chance to say their word, make a decision and such. Do you think such behavior might bring harm to the development of their personality, and they should be instead treated like adults, but just less experienced, so with understanding and patience?
Treat them according to their age. Let them be happy or pained is needed but never make them feel hate. Let kids be kids. Let them feel that they are kids.