Oh my, I don't think it's good for you or the children. But that is my opinion. I know that I, physically, emotionally and financially would not be able to provide each child with their emotional and physical needs with that many children spaced that close together.
Drs. and the American Journal of Obstetrics and Gynecology advise to give your body at least 12 months before becoming pregnant again after having a baby, to allow your body to heal, to reduce the risk of preterm birth and other health issues, and to be able to nurture and bond with your current newborn before the other one arrives, and before pregnancy nausea and fatigue set in so you can care for your infant and give it the attention it deserves in that first crucial year. Also, your body needs to heal, hormone levels have to return to normal, softened ligaments have to tighten, and stretched muscles in your abdominal wall and pelvic floor need to regain their tone for another healthy pregnancy. You also have to regain lost nutrients. If you had a c-section, the recommended time for body healing before a second pregnancy is 12-18 months. You can read the findings and reasonings here:
http://www.pregnancyandbaby.com/baby/articles/930607/how-...
http://www.babyexpert.com/get-pregnant/naturally/how-long...
You have two toddlers, two infants and you will soon have three toddlers and two infants. All I can say is good luck and I hope you and your children have a good support system! I'm not being rude, but I wonder how you can crave a new baby, when you already have a 2 and 12 month old on top of two young toddlers, and how much quality one on one attention each of those children are receiving. I have 2 and one on the way and it can be very challenging to say the least. I am not against large families in the slightest, or even having them close together, my only concern with such close spacing and so many is that mom and children are physically and emotional bonded and taken care of, so as long as you are all thriving and happy, that is important. Everyone has a different capacity to do that. My sister and I are 18 months apart and my children are approx 23 months apart.