Imo, for gender that could reasonably be a personal choice and the boomers telling her she should wait are kinda dicks.
Testing for genetic issues I would absolutely do and I think others should, but it is of course still their personal choice and shouldn't be forced on them. I would abort a fetus with any genetic issue. The sooner to find out the better. Fo others who wouldn't terminate, knowing ahead if time that they are going to have a disabled child would at least give them time to prepare.
Also, obligatory reminder that, technically speaking, people with down syndrome are not actually human because they have a different number of chromosomes. Offspring of a species having a different number of chromosomes from their parent generation, then reproducing with other offspring of the parent species that have the same number of chromosomes as them is a recognized route of evolution from an ancestor species to a new species. It may not sound PC, but that's biology. (Example, lots of species of daisies that look similar, but cannot be cross-pollinatated.)
In gentler more office politic friendly terms this is essentially what I said, although I didn't know they are technically a different species, and got admonished by my boss who thinks that "difficult to love babies just need more love" and implied I'm a bad person
Anyway the testing was done, there are no abnormalities and it's a boy! NIPT (non evasive pregnancy testing) costs ≈$500 where I'm from while essentially everything else medical is free. I wonder why as a society we are choosing to discourage finding out about serious disability in favour of spending many more resources to care for people with defects like downs syndrome for the rest of their life. It's not even illegal for them to then breed and create more burden on society