My LO is 15 months it hardly blabber anything. Is it something I should worry?

At your 18 month old routine checkup (with PD/polyclinic), they'll ask about whether your child is keeping up with development milestones (refer to health booklet, there's a checklist!). For my son, he was not blabbering/talking much at all - so we got referred to a child development unit. Long story short, we had an assessment and found out that he has isolated speech delay - the wondrous ability to understand several languages, but the frustration of not knowing the right word and language to express himself. What I can suggest is to highlight it to a PD, and if you're really worried - get a developmental assessment done through referrals to child development units. Yes, they all take time to learn to speak and every child is different, but sometimes if it doesn't feel right to you - get it checked out and help your child out if there's really anything to be concerned about!