So emotional over first birthday

My wee boy turned one today. We still threw him a party, I decorated, I made a cake. We FaceTimed family. It was such a lovely day, but obviously weird given the circumstances. Took loads of photos and videos for memories. Now he’s asleep for the night, I find myself really emotional. I don’t know if its because of lockdown or because my babies now one. Been a brilliant day, but at the same time a difficult one.