How Smart Is My Baby!

I'm going to brag for a minute. My little Lulu, who is barely fifteen months old, was running after me earlier yelling, "Tahgah! Tahgah!" and when I turned around to see what she wanted, she was holding up a piece of yellow paper that was a triangle shape! I'm 99.99% sure she was saying triangle. Especially since just a few minutes later she was looking at a hole in the side of a box and very clearly said, "Circle!" Also, I know she knows hearts and stars. I don't know how she learned those shapes, exactly, or why they were the first she recognized. We don't drill her on shapes or anything. She just seems to remember when we show her. My baby is brilliant!