Desperate Housewives/Headscratchers

So, can anyone tell me why this one neighborhood just happens to be full of stay at home moms, house wives, and women in general that just happen to look like drop dead sexy super models8?
- Most TV drama's do this. Everyone on the House cast could be a model, male or female.
  - Taub? Really?
Gabrielle became pregnant with Juanita either some time after or before the fourth season finale, therefore making her pregnant in 2008, and giving birth sometime around early 2009. The show then skips ahead five years to 2013, making Juanita four. Now we're in the seventh season in 2015, which would make Juanita six...and yet everyone is saying she's eight? ("The daughter I've been raising for eight years..." "Susan, do you remember what happened eight years ago?") What the hell? I know Writers Can't Do Math, but seriously, that is just ridiculous. I'm no math expert, but it's just basic, simple math. And somehow, I don't think SORAS is to blame in this case. I've seen fanfiction writers be more consistent with character aging.
- Maybe they stole her like Paul and Mary Alice did. And no one in the neighborhood but Julie ever knows enough math to even do their own taxes, so it's the perfect crime.
- Juanita could also be seven, meaning she's in her eighth year of living.
Why didn't Gabrielle and Carlos keep the baby that their Chinese surrogate gave birth to? Just because it wasn't genetically theirs doesn't mean it's not a child for them to raise, I mean, they were willing to go through adoption, and tried to take the illegitimate child of a stripper, so why did they suddenly not want this one?
- I don't remember exactly, but I believe they mention that there was a mix-up when the embryos were implanted. The baby belonged to another couple, so it's possible that they decided to take him and raise him. Carlos and Gabrielle's baby didn't make it.
Paul Young would have never been caught and found out about how he and Mary Alice killed Zack's real mother if he didn't decide to just randomly dig up her body and chuck it in the water. Did he think that people would sooner drain his pool, dig through the concrete beneath it, and then pull up the chest the body was buried in than if he just tossed it outside?
- Clearly someone knew about the Youngs murdering Deirdre, how could Paul be certain that the same person hadn't figured also where the body was buried?
Wasn't Andrew engaged in season 5, hence why he moved out into his own house on the neighborhood? His fiance is never mentioned at all in season six, and it even mentions Andrew having sex with some of Bree's new employees, without any mention of infidelity. Considering it was kind of an important subplot for Bree and him in season 5, it seems sort of weird to just brush it under the rug.
- Actually, Bree DID ask about Alex when it came to light that Andrew had been sleeping with an employee. It was simply left alone, likely because of the name of the show being "Desperate Housewives," not "The children of desperate housewives" and Andrew was only a recurring character, not a main cast member, in Season 6, with Bree's plot of Rex's illegitimate child coming to the forefront over Andrew's infidelity. And in Season 7, Alex has left Andrew because of him developing a drinking problem, though he is referred to as Alex's husband, so they must have gotten married off-screen.
At the end of season 6, Orson leaves Bree because she made him turn himself in for running over Mike and did not make Andrew do the same when he ran over Juanita Solis the Elder. All she can say is that 'he is my child'. Why did she not point out that what Orson did was on purpose and what Andrew did was an accident?