My infant received the DTaP at 9 months, 2 weeks, 1 day. She was 16 lbs. She also received her polio vaccine the same day. That evening, 11/18/2016, she spiked a 102 fever overnight from Wednesday to Thursday that I assumed was related but a normal immune response. Then she had a couple dirty diapers that were green and kind of liquid that really burned her bottom. We hadn't eaten anything new except she had applesauce (natural, unsweetened) for the first time Wednesday night and Thursday with lunch, but I don't think that can cause stomach upset.... anyway, she was in bed that Wednesday night asleep by 8:30pm. She was still asleep the next morning (11/19/2015) at 10:32am! I went in and checked to make sure she was breathing frequently. She would kind of rouse a little then lay down and go back to sleep. I messaged our doctor's messaging system to see if I should be concerned or do anything. My other two never did this. Even if ill, they never slept nor sleep that much. She already had a low grade temp (100.4) when we saw Dr. on Wednesday but no other symptoms until after the vaccine. She slept and slept and slept from bed time (8:30pm) the evening of the day she got the vaccine and just wouldn't  rouse. When I finally did get her up to offer her to nurse, she was very fussy, which isn't like her at all. I went in to change clothes about 11:15am (day following vaccine 11/19/15) and she didn't wake but I dropped a shoe and she woke and saw me and fussed to get up so I got her up and nursed her and she fell right back asleep. My husband came home a few minutes later for lunch and he changed her diaper while I ran a quick errand and he said it was wet, but not that wet - and she had been asleep 15 hours... and she then fell back asleep in his arms and he held her until I got home. I got home and all she wanted was to nurse and sleep. I laid her down again around 1:20pm after nursing for a while and she continued sleeping. I then messaged our doctor's office again. They stayed in touch checking in on her. She finally woke around 4pm that afternoon and nursed but was fussy and stayed very fussy and tired that day. It was then a rough few days. After the 20 hour sleeping marathon, she continued to have temperature spikes between ibuprofen doses. Being in touch with our doctor, we continued to treat symptoms at home. On Friday 11/20/15, she was awake more but still spiking a fever, fussy, and I noticed she was posturing with her left fist/arm where her left thumb was tucked in her fist and her arm pulled back. I would try to open up her hand and she would pull it back into that position. THIS IS WHAT SCARED ME THE MOST! The posturing! This lasted for several days along with the high fever. So Saturday 11/21/2015 we took her in to a clinic and saw a pediatrician - she said her right ear was infected so she got a shot of rocephin antibiotic. However, this was based on just some ear redness and no tests were done to confirm infection and whether it was bacterial or viral. Sunday morning she seemed to be perking up, her temp was around 100.3 and she hadn't had any ibuprofen since the clinic about 5:30pm Saturday. So we went ahead and came to traveled for the Thanksgiving holiday, on Sunday 11/22/2015. About an hour into the trip, she cried so I stopped to check her diaper and nurse her. Her temperature was back up over 102 (this was about 11:30am Sunday), so I gave her infant ibuprofen. She traveled pretty well and slept a lot, nursed pretty well and had a good number of wet diapers. Her cough was worse - and really wet. At bed time her temp was 98.8 so I thought behind us. Monday morning, 11/23/2015, her temp ran 100.2 to 99.8 so still elevated but not too bad - and her last ibuprofen was 11:30am yesterday. Also on Monday 11/23/2015 her body was covered (trunk and face and neck) with a rash - it didn't seem to bother her and wasn't raised at all. She's also continued to cough quite a bit. She also was really clingy, fussy and just looked and acted tired a lot. She also was having Christmas-tree-green dirty diapers. These dirty diapers did a number on her bottom - I've not had a baby get this kind of diaper rash. She was pooping often and about one a day is thick and more normal (though green) and the others are watery. Her bottom was just raw looking front and back and she was fussing when I wiped her. It took until Saturday 11/28/2015, a full 10 days after the vaccine, for her to start to seem more healthy, stop posturing, and be fever free. Her bottom started healing and her dirty diapers slowly returned to normal. The high fever and posturing of her left hand for days was very concerning. After talking to our pediatrician, his nurse, and a vaccine scientific journalist I follow, we felt it wise to report this. We fully believe her reaction was to the DTaP vaccine.