The negative effects of an MMR is a hot and highly debated topic so be prepared for all sides in this discussion.
I will tell you what I know based on my experience with my children....and two years of research I have done for MY kids.
It is not uncommon for children to run fevers, have diarrhea, moodiness, etc. after shots.
BUT
the MMR seems to be one that many children do have a higher level of difficulty with. My children did not do well with the MMR. One of my children lost the ability to self-feed after the MMR and began showing signs of Autism specifically after the shot. I have known children to lose their speech, regress in gross motor and fine motor skills immediately after the MMR.
I'm not trying to frighten you but it is absolutely possible that the symptoms you are seeing fall into the basic category of MMR difficulty at some level.
What I have learned over the years is how to react AFTER the vaccinations. Things you can do. I need to say I am not a doctor of any sort or homeopath...just a mom who has needed to do damage control. So take my "advice" as mom's advice and not medical.
#1. When you do baths, add some epsom salts. Start with a small amount (1/4 cup) and let him soak in it. Epsom salts are great for several reasons. It is a natural chelator...so it helps the body rid itself of everyday environmental and food toxins...so adding that in will help him to pull out the vaccine toxins a little at a time. Epsom salts are also a great source of magnesium which is "natures calming mineral". Great for moods and relaxation.
#2. I'm not sure about his diet but have him eat/drink as clean as you can for a while. Reduce the sweets and preservatives as much as you can and increase his fluids.
#3. Find a way to add in extra acidophylus to his diet. You can do that through yogurt or over the counter acidophylus. One brand that Walmart carries has a sippy straw filled with it...and since it has no taste, the kids sip it down without knowing. I do, however, recommend that if you really are digging in for healing....to buy yours from www.kirkmanlabs.com because not all acidophylus is created equal. But any is better than none.
#4. Try to eliminate food dyes. It is very hard but food dyes contain toxins our STRONG adult bodies aren't able to chelate out....a young child in a "compromised" state (so to speak) will be harder hit by the effects of the food gunk. I'm not an extremist...but once I learned that food dyes are derivatatives of coal tar, petroleum and/or coloring from dead bugs....it was a no brainer for me to remove them permanently. BUT if you are able to just reduce or eliminate temporarily, it would still be extremely beneficial for this time of healing.
I wish you and baby well. God Bless.
D.