Parents need to communicate with their children more and talk to them as much as possible. Of course, they don't need babbling, but normal language communication.
Increase perception
Parents need to increase their children's perception ability in peacetime, and they need to let their children develop their sense of touch, smell and some sports ability.
listen to more music
Parents need to let their children listen to music often. According to scientific research, listening to music often can make children smarter.
Participate in group activities
After the child is one year old, parents can guide the child to participate in group activities, play with other friends, let the child participate in group life, let the child adapt to some principles of getting along as soon as possible, and improve social skills.