We wanted to be just as surprised as everyone when we found out the gender of our first child. We bought baseballs off Amazon like the ones below. We took those to the doctor and when he gave us the blood result in a envelop we had him give us back the correct baseball to use at our party. It turned out great!
Baseballs – https://www.amazon.com/BabyPop-Gender-Baseballs-Exploding-Supplies/dp/B07DR9GRJ9/ref=sr_1_3?crid=1W5FP1RRLCF0X&keywords=exploding+baseball+gender+reveal&qid=1562041960&s=gateway&sprefix=exploding+base%2Caps%2C512&sr=8-3
