Aye but you know he is thinking about it, his eyes are on the sausage, he then looks you in the eyes, he wants that sausage but he is conscious that he's not allowed that sausage. It may not be the same complex levels of thought we are able to maintain, but it's definitely thought.
On the subject of babies - my oldest was born premature with lots of complications. Every part of me was devastated at the thought that this baby could die, this baby which I had never known and barely even held. It was an instinctive and human emotion to try everything in my power to make sure that this little stranger had a chance.
As a mammal who is sitting here trying to define what is right and wrong, this seems like a very obvious starting point; evolutionary instincts that drive you into making sure your young have every possible chance of making it.