kaexin, huingee,
Only because YT has long practice with lego. Cuz last time she first started playing with those very big blocks, think is megablock, as a hand-me-down when she is under one (I think, can't remember exactly). Then SIL gave her a lego set, toddler sized one, and then finally I gave her the vehicles set (normal sized). She also like to look at her cousins' building their lego vehicles so she learn from them too. Of course, since she LOVES vehicles, naturally she is good at making these.