Airman surprise!

Summer • 11/6/18👦🏻 11/28/19👶🏻 March 2021🤰🏻

So at the end of May I’m going to visit my airman who’s away right now, but here’s my issue, I will know the sex of the baby and he won’t yet so I want to do something fun to surprise him when I go, any ideas on revealing the sex to him?