This is such a cute idea! Question for you? Can they tell the gender of your baby on a 3D ultrasound at 13 weeks? I have one scheduled next week and I'll be 13 weeks.
They can figure it out on 2d as early as 2 weeks. Mine was done in 2d...she was able to tell the sex on both babies & said she wouldn't tell anyone that early unless she was certain. Them afterward she did the 4d pics. Went to my gender ultrasound last week & she was correct...definitely 2 boys :) good luck !