I dun think it true ... my first one is girl n she reach her milestones earlier but now P2 she is in weak class .... but my youngest son now 5 super slow reach milestones but among all 3 kids he is the smartest for now ... but still depend on individual I feel some need more time to catch up n now even kindergarten kids already start feeling stress they may be good at start but who know due to stress they may just slow down rite .
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