Alexei,
There is another way of looking at it... What made you think Adam and Eve did not know right from wrong? I think they were not like babies at all. I think they did know the difference. Why? Look very carefully at the dialogue in Genesis chapter 3 between Eve and the Serpent. You can see here that God had talked in detail with Adam and Eve and they knew the consequences of disobedience.
1. "Did God really say?" was the question the serpent asked of Eve, and Eve's response was very specific as to what would happen if they did eat the fruit "you must not eat from the tree that is in the middle of the garden and you must not touch it, or you will surely die".
2. Look at the response of Adam and Eve when they realised their nakedness...they immediately hid from God. They were ashamed and they knew what they had done. Why? Because their fellowship with God was gone. Since creation God had walked and talked very intimately with God. They had enjoyed unbroken and unhindered fellowship with him, such as we will only enjoy in heaven when we see him face to face. When God approaches them for his usual walk, they reacted by hiding from him.
These are not naive babies.. these are adults who had been instructed and fellowshipped with God in a way more intimate than you and I can ever know on this earth. You see, God is a completely moral being, but that doesn't stop him from knowing immoral behaviour, right from wrong, good from bad. Just because He doesn't practise sin, doesn't mean he doesn't know the consequences of sin. The eternal principal is that the wages of sin is death, and Adam and Eve without a doubt knew this principle, as it had been told to them and explained to th em by God Himself.
No matter how much we try to rationalise what went on in the garden.. it does not change the reality of the situation.. man was and still is given the ultimate choice to accept or reject God's laws. The Bible in Romans 2, says that men are without excuse as they ignore what is clearly visible about God. Adam and Eve had the most intimate of relationships with Him, and if we who do not enjoy that sort of a relationship with God, are without excuse, how then can we begin to rationalise Adam and Eve's disobedience as something that can be explained away.
They knew what they were doing, they had been warned of the consequences and they chose to follow the path of disobedience.