WHERE has the time gone??

Sigh...how did my babies get SO big??? I know time has passed, and I watch them grow every day...but I look at photos from only 2 years ago...and see a baby girl with barely any hair on her head and then I see this BIG girl with LONG red hair and so smart that she passes her what her sisters knew at this age already. I am floored, and a little nostalgic knowing that she is my last little bird in the nest. Sniff...