It is also common for children before the age of three to beat people up. Babies sometimes want to play with other friends, so they accidentally slap each other in the face ... One-year-old or two-year-old children usually understand the concept of severity, but sometimes they have an experimental mentality and may try to shoot people with different intensities. Often we see that older children will gently touch the baby at first, and soon it will become a big palm.