What does it mean when a guy sends you a picture of him when he was little in response to your baby pictures?

A couple nights ago I sent him a few pictures of when I was a baby and each time he got it he called me and said "oh my God Kaylee!!" With laughter. Then about an hour later he sent me a picture of him when he was 3 or 4 in Mexico, where he's from. And I've been thinking about it and looking at the picture so a little bit ago I asked him "So you've always been cute like when you were little?" He laughed and said "oh my God! That picture, I was like 3 or 4!" I said "you've always been cute? You were cute then and you're cute now and the whole time I've known you!" He laughed and said "oh my God!! Kaylee!!!" Very funny and interesting. And I downloaded an app to put 2 pictures together and send it to him. I put the little picture of him and a more recent picture of him together and I sent it to him. He immediately said "oh my God! The picture of when I was little!" I said "I tell you!" But what made him respond to my pictures with a picture of him when he was little?
Please and thank you
What does it mean when a guy sends you a picture of him when he was little in response to your baby pictures?
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