What happened to Gabrielle & Carlos' baby?
Xiao-Mei, their surrogate, gives birth to a black child and the Doctor confirmed that there had been a mix-up with embryos. Presumably, that baby was returned to his correct parents, though this is not specified on the show. Carlos and Gaby's embryo did not successfully implant into the surrogate of the other couple. Despite being informed that it was highly unlikely Gaby would be able to conceive children, by season six, Carlos and Gaby are the parents of two daughters - Juanita and Celia. Gaby was pregnant with both children and carried both to term.
How much time has passed in total?
Approximately 11 years and 9 months pass from the beginning of season one until the beginning of season seven. There have been 6 seasons, so about "6 years" worth of time, plus the 5 year time jump, that makes 11 years. There have also been three other short jumps in time over the seasons that make up the other 9 months. No time passes between season one and season two. 6 months pass between season two and season three. 1 month passes between season three and season four. 5 years pass between season four and season five. 2 months pass between season five and season six.One may argue that each season is not exactly one year, as it's not an entire year for us in "real time" either. While this is a very valid argument, the considerable age jump in the Scavo children at the beginning of season 5 is consistent with a 9 year and some month increase from the beginning of season 1.
What are the housewives' jobs?