One possible explanation is this: you take care of your children very hard every day, so when you see your children fat and clean, you will feel a sense of accomplishment and be happy. If you look at a dirty and thin child, because you are full of motherhood now, subconsciously you will feel that this child is also taken care of by you. You work so hard, but your child is dirty and thin, you will feel very lost, you will feel that you have no return, and you will be very angry. It's like you have worked hard to cook a table of dishes. If your family says, Wow, it's delicious! You must be very happy. If the family says: What is this? It tastes terrible! You will be very angry. The behavior of wanting to hit people is often because other people's behavior does not meet your expectations.