The problem is that correlation is not causation.
Many developmental problems (e.g. autism, ADHD, etc.) first manifest themselves around the time that kids go through the vaccine cycle. It's quite natural to think that there must be a connection . . . but there's no evidence of a causative connection.
My youngest (also adopted) has ADHD as well. Lots of theories but not much hard science. My personal observation is that geek-on-geek marriages produce a lot of kids with ADHD and autism spectrum disorders. Look at the rates in Silicon Valley. I've also seen it in my own family --
I have driven through stop signs and red lights without causing a traffic accident. I have driven well above the speed limit without causing an accident. I have written not just texts, but long emails while driving without causing an accident. Therefore, none of those things cause traffic accidents. Are you going to recommend that your children ignore all the advice to ignore those behaviors while they drive since they clearly don't cause accidents they merely correlate to them? The vaccine cycle start when they are newborns and continues for years, so yes many issues do not manifest themselves except from birth through the first several years of life which happens to be when you want them inject with vaccines. How many combo(ie MMR) type vaccines studies on newborn or infants do you think there have been? The CDC has been shown to have mislead the public on vaccine safety already. Search the linked document from the FDA and see if autism occurs in the side effects. In full disclosure, I have not searched for a link between autism and geek on geek breeding(or marriage) Perhaps you could link an article on this particular issue. In personal experience, I see just as many autistic spectrum disorder children among the "cool and stupid" as I do among the "geeks". Though intelligent parents with greater resources are usually able to bring medical and psychological professions to bear earlier in the child's life
http://www.fda.gov/downloads/BiologicsBloodVaccines/Vaccines/ApprovedProducts/UCM101580.pdf
Here is an excerpt in case you don't have time to wade through the whole pdf:
Adverse events reported during post-approval use of Tripedia vaccine include idiopathic thrombocytopenic purpura, SIDS, anaphylactic reaction, cellulitis,
autism , convulsion/grand mal convulsion, encephalopathy, hypotonia, neuropathy, somnolence and apnea. Events were included in this list because of the seriousness or frequency of reporting.
Then there is this
http://articles.mercola.com/sites/articles/archive/2012/06/25/mmr-vaccine-caused-autism.aspx Italian Court Rules MMR Vaccine Caused Autism
Valentino Bocca was given an MMR shot in 2004, at the age of 15 months. According to his parents, the change in his behavior was immediate. That same night he refused to eat, and he developed diarrhea during the night. It quickly went downhill from there. Within days he was no longer able to put a spoon to his mouth, and he spent nights crying in pain. His parents immediately suspected the vaccination, but were told this was "impossible." Valentino progressively regressed, and received the diagnosis of autism a year later. In the final analysis, the Italian Health Ministry disagreed with the initial conclusion of the pediatrician, conceding that the vaccine was at fault. As a result, a court in Rimini, Italy recently awarded the Bocca family a 15-year annuity totaling 174,000 Euros (just under $220,000), plus reimbursement for court costs, ruling that Valentino "has been damaged by irreversible complications due to vaccination (prophylaxis trivalent MMR)i." According to a featured article in the UK newspaper, The Independentii, about 100 similar cases are now being examined by Italian lawyers, and more cases may be brought to court. "Luca Ventaloro the family lawyer, said yesterday: "This is very significant for Britain which uses, and has used, an MMR vaccine with the same components as the one given to Valentino. It is wrong for governments and their health authorities to exert strong pressure on parents to take children for the MMR jab while ignoring that this vaccine can cause autism and linked conditions." The number of autism cases has risen sharply since the 1970s, with one in 64 British children affected," The Independent reportsiii .
Now, I am all ready to go with your personal observation, but the FDA and the Italian Court System seem to think there might be something to vaccines causing some undesired results for some people. So, that and my personal experiences and knowledge of vaccines causes me to realize that you might not be the Mona Lisa Vito of vaccines. So, you still have not swayed me.