This is MOO... I think there is a real possibility that he is covering for his wife. She could have placed Thomas in the car, thinking her husband was about to walk out the door. Maybe he was on the phone, or occupied with something and acknowledged her. My husband pretends to hear me with some form of acknowledgement quite often.

It seems to me that emphasis was placed on the morning prayer with Thomas, to make it known that he knew he was in the car, along with the McDonald's stop. The afternoon errands have never been detailed publicly.
Wonder if there was a diaper bag in the car, and if so where it was located. I always carried one to travel even a short distance. Usually a bag is left with food, a favorite toy or naptime stuffed animal/pillow, etc when dropping off at daycare.
It was not mentioned if food was purchased at McDonald's for both of them....
I don't think this was done intentionally. Would love to hear answers to many questions. I believe sweet baby had already passed away when Dad returned to the car after three hours in court. Like others that commented, I believe there would have been an odor of feces. I remember leaving a soiled diaper in the car by accident a time or two. When it was hot, after a short period of time, we had to air the car out. When he was headed to daycare and said he heard a noise, it is possible there was a shifting sound, but a smell is more likely.
In hopes the truth will come out. Whatever that may be, all possibilities are sad and tragic. If he truly had a lapse in memory, and believed in his mind he had already dropped Thomas off at daycare, he will never get over the what ifs. I have on more than one occasion driven off without the food after paying for it, as someone else commented, have driven to a home that we moved from the previous month, looked for my phone while talking on it, etc... I have never forgotten my son anywhere, though. I am far far from Mom of the year (too scattered), but can't imagine that happening. I thank God it never did, and hugged my 8 year old lil man a little tighter when I read this story. Can you imagine the quietness of the home without the 18-month old around anymore, or the guilt the father feels when his wife cries for her baby?
I have read comments on social media that he looks smug and without remorse. I think he looks as though he has aged significantly, and his eyes look as though he never stops crying. Instead of looking up and walking with confidence, he looks down, and clings to the hand of his wife. He looks like a broken man. I am not by any means saying he shouldn't be, as I would be in an institution weaving baskets. It is just an observation and opinion.
From what I have read, many or most of these cases don't result in jail time. If the jury finds him not guilty, it is unlikely he will feel any joy or relief. Does anyone know if the prosecution will have to prove intent? If so, I don't see that happening.