How can you change a sims gender in sims 2?

Typically I always get asked this There's a way I had found on YouTube that once you have the baby on sims you can change the gender but i have tryed to do the way they had told me about 2 to 3 years ago and I couldnt find it out so i tryed looking the site up and never found it so Good luck Trying!

P.s im pretty much saying you cant really change it but my friend Zelda Morrow is Genius with this stuff go on her YouTube channel 321zeldyweldy123 Again Good luck!