As a parent, you can check-in your child via QR code:
Open the Parent app
Click Check-in
If you have more than 1 child associated with your account, select the child you will check
After that, a check-in record will be added for the child.
Parent or Caregiver can also use the Centre Kiosk app too for check-in (multiple child):
At the centre kiosk, click Parent / Caregiver
Page will be moved to Authentication screen
Enter your NRIC/FIN
Select one or more children from list children associated with me
Click Check-in
After that, a check-in record will be added for the child.