Am I too "sappy" of a mom?

I just finished packing up my son’s 3–6 month clothes. I cried the whole time! I do this every time I pack up things he has outgrown
At first, I thought it was hormones. They have been back to “normal” for quite some time now. I guess I can’t use that excuse anymore!
Does anyone else have this issue? I am overly sappy or do most parents find the growth of their children bittersweet?