By right should be at birth, 6 months, 12 months, 15 months and 18months. You will also be notified 2 weeks prior to the top up. http://www.ifaq.gov.sg/BBSS/mobile/index.aspx#Detaildoc/134052 If you didn't receive any notifications when it's a month post due, please give them a call or contact them at https://www.ifaq.gov.sg/bbss/apps/feedback.aspx.
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