It's a good idea for the daddy to be to get genetic testing done. It may just help them know if they need to prepare for the chance of a kid being born with CF. Both parents would have to be a carrier of CF, and if so, then the baby would have a 1 out of 4 chance to be born with cf. If the daddy isn't a carrier, then no worries. It's funny. One of my brothers is a carrier and his wife isn't. The other brother isn't a carrier but his wife is. My ex and I were both carriers (apparently) as our oldest child doesn't have CF but my youngest son does.
Usually insurance will pay for blood to be sent for genetic testing in the situation where there's a baby on the way or the possibility of a baby on the way.
My son wasn't diagnosed until he was 3.5 months old and was a very sick little one until then. Hopefully they can find out if there's the possibility and if so, be prepared to get the baby tested at birth (little heel prick for drop of blood). Most states now do this test with the regular ones they run, but ours didn't at the time.