Please don't feel bad. Not many of the babies I know had parties for their first birthday, including C.
We went out, just the 3 of us on his actual birthday to the zoo, then had close family (our parents, brothers and sisters and my nephew) over on the Sunday. We still put balloons and a banner up, and got matching jungle theme plates, cups etc, (I made everyone use them!), and I made a cake.
Tbh, I couldn't have coped with the organising of a big party, and the afternoon we had was lovely x