From what I understand, the anterior fontanel typically closes somewhere between 9 and 18 months, but the window can stretch to 24 months for some babies, so at 1 year 9 months, your little one is still within a range that some doctors consider watchable rather than immediately alarming. A friend of mine went through something similar and her paed just monitored it closely at each visit, checking for other signs like head size or developmental milestones before deciding if further evaluation was needed. The general take seems to be that if it hasn't closed by the 24-month mark, that's when the paed would typically want to dig deeper, but even before then, it's worth flagging at your next visit rather than waiting it out quietly. Do bring it up with your child's doctor or a specialist though, since they can assess the full picture properly and give you proper peace of mind.
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