B.S.
Congrats! Me and my husband celebrated our 1st last weekend. Although we went away for the weekend. I gave him some naughty stuff. Not too naughty. A message kit and a fun board game. I did want to do that sentimental stuff but I figured thats what birthdays and Christmas is for. At least for this year.
For a sentimental thing, maybe put a scrapbook together of you and him and your child that you guys can look at.
Good Luck!