When or how often do I need to update the milestones on the HealthHub app?

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• When or how often do I need to enter the growth information like height and weight on the mobile app?
• Will the system remind me on when and what to do? How often will I be reminded?
• Do I still need to bring the hard copy Health Booklet when my child visits the clinic for immunisation/vaccination or developmental assessment?
• Is this going to replace the hard copy Health Booklet? What is the difference?
• What are the eligibility criteria to add a child in HealthHub?