They didn’t have gender reveals for the other kids, they said in a recent video. This is their last baby so maybe why. And they’ve never waited this long to find out either, it’s just dragging out because they wanted the private scan for both mothers to attend the first appointment being cancelled. They were actually told at their 20 week scan I believe but Joel hid the envelope so Sarah wouldn’t find it, but as we know she isn’t a patient person and probably did find it. I do think the constant mention of boy or brother is a tad annoying, when they spoke to kaci and said ‘your baby brother or sister’ she replied brother. Will she be upset if it’s actually a sister? I do get they want a boy, but maybe don’t be so vocal about it that way you can easily hid any disappointment without judgement. However, I do think this one is a boy and they’ve known all along.