Why does time fly?

First off, children grow up too fast. I want them to grow and experience things, but couldn't they do it at half the rate. It just goes by too quick. Everyday Reese takes a lunchbox to school (which is everyday but chicken tender day and maybe an occasional other day) I have always sent him a note in his lunchbox. Well, Last Thursday, Reese said kids in his class teased him b/c I had a heart on his note. I asked him what he said to them and he just grunted and said that is what he did. I told him to ask them next time if their moms loved them b/c I bet they do!!!! Then, asked if he wanted me to stop sending notes in his lunchbox. He looked really sad, and shook his head no. Then said, "but can you just hide them so only I can see them." How sad!! He is growing up! So it has been also been almost 5 months since princess baby entered our family. That is just amazing and so sad BC I have to go back to work tomorrow. I am so upset. I have had a wonderful time off. 5 months has been great!! Now it is back to the real world of teaching....