The 6,000-square feet preschool on the ground floor of terminal one can take in 90 children from one month to three years old, as long as one of their parents are employees working at the airport.

More than 40 toddlers have been guaranteed a place.

Aimed at providing a family-friendly facility to enable staff to work without worrying about their children, the first preschool, set up in 2017, was popular among staff, said Florence Chung Wai-yee, executive director of human resources and administration.

The 46 places were snapped up quickly and since more applications came in, a larger second preschool was set up with 90 places.

Parents of children attending the first preschool - at the airport's commercial building - found it convenient to drop off and pick up children, and their kids becoming self-reliant.

Paying a tuition fee of HK$4,045 a month, parents can drop off their children off at 8 am and pick them up at 6 pm on weekdays.

Applicants need to be employed by organizations or companies located at the airport and work no less than four days a week. Places are allocated by lottery.

The preschool includes activity rooms for children of different age groups equipped with teaching aids and entertaining facilities.

Toddlers can read, paint, play musical instruments, and also prepare simple food like sandwiches at a mini kitchen, to learn about ingredients and cherish the food.

Preschool principal Emily Chan Yue-man said it will ensure every six children is looked after by one teaching staff. Two nurses, one more than at the first preschool, will also work at the school to provide emergency care.

This is also the first preschool to have three breastfeeding rooms in Hong Kong, two more than the first airport preschool, said Chan.

Tam, a mother whose daughter started attending the school at five months old, said she books the lactation room to feed her child during work breaks, which also enabled her to have more bonding time with her daughter.

"It is also reassuring to have a nurse available to provide emergency care," Tam said.

Hui, mother of a boy who is over two years old, said she has heard other parents saying they could take their children to hospital immediately if they feel unwell as the preschool is close to their workplace.

Tsang, a father whose daughter and son have both graduated from the first preschool, said they have become independent.

"I was satisfied with my daughter's admission interview for primary one. She was calm and followed the teacher's orders while other children were crying when separated from their parents."