Finding out baby’s sex later

I have my 32 week ultrasound coming up. I don’t want to find out the sex until baby is born. But my husband is starting to get very worried about gender disappointment in the delivery room (this is our last baby so no more chances) and I’m thinking about letting him find out now. Can they see the sex at a later ultrasound and write it down for him? This feels like a dumb question but idk if baby might be too big or something.