there is an increasing trend around the world to have a small family rather than a large family

In the 21th century, there is an increasing trend around the world  to have a small family rather than a large family. Why do they like to have a small family? Because there are some advantages of having a nuclear family, a family only have one or two children. These advantages is that you can bringing up their children in the best conditions and release the pressure on their shoulder.
If you have only one or two children, you will graduate your children better. You take care your children carefully about physical and spirit. Children is always have a lot question around them, they are curious about nature, people, emotion even sex. You can spend more time on them, talk to them,  listen their thought or emotion, help them to solve child's problems or questions. Parents are the best friend to help child develop completely.
Moreover, when you have a few child, you don't have a lot pressure of finance. The don't have to take a lot of job earn money to rise their family. You have much time for your family. Sometimes, you have some picnic for your family at weekend or you go out for eating or drinking. The atmosphere in your family is full of fun and happiness.
Besides, there are some disadvantages for their child. Due to the parent take care so much that they made them spoiled. They don't want to do anything and can't adapt themselves with difficulty in the life. However, they still want to have a small family in order to graduated their children in the best condition.