The novelty wore off as I expected it would. Now, at just 7 and 33 months, they are friends. They laugh at each other, bug each other, but most of all share a strong mutual love for each other. It is endearing.
But just the other day Katie made me have a flashback. She asked to give Andrew his bottle. She hasn't asked to do this in months. I was a little scared that she might tease him or try to squirt it in his mouth, but I said "yes" like a patient mother would do. She did a great job and they both got a few chuckles out of it.
I got the camera to document just one more moment that made me smile.
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Andrew at a couple days old

Andrew at a couple weeks old
Andrew 7 1/2 months old, Katie 33 months old