Babies in Europe and America can swim in the water in four to six weeks. In Germany, baby swimming lessons begin at the age of four months. In Japan, the baby began to learn to swim in about six months, while coach Huang's own baby went swimming in more than three months.

In fact, the starting age varies from place to place because it depends on the temperature of swimming pools in different places, and it is not directly related to age. The swimming temperature of newborn babies from zero to six months must be controlled at 32 degrees Celsius to 32.5 degrees Celsius, but for adults in the same pool, the water will be very hot. But for babies over six months old, the water temperature can be maintained at 30 degrees Celsius to 30.5 degrees Celsius.