(v5:66) Narrated Anas r.a: When the news of the arrival of the Prophet saw at Al-Madinah reached Abdullah bin salam, he went to him (i.e. the Propher saw) to ask him about certain things.
He said, "I am going to ask you about three things which only a Prophet can answer:
What is the first sign of The Hour?
What is the first food which the people of Paradise will eat?
Why does a child attract the similarity to his father or to his mother?"
The Prophet saw replied,"Jibrael(Gabriel) has just now informed me of that."
The Prophet saw said,
"As for the first sign of the Hour, it will be a fire that will collect (or gather) the people from the east to the west.
As for the first meal which the people of Paradise will eat, it wil be the caudate (extra) lobe of the fish-liver.
As for the child, if the man's discharge precedes the woman's discharge, the child attracts the similarity to the man and if the woman's discharge precedes the man's, then the child attracts the similarity to the woman."
On this, Abdullah bin salam said, "I testify that La ilaha illahllah (none has the right to be worshiped but Allah) and that you are the Messenger of Allah."
From me: Now, I know how and why a child looks like the father or the mother!!!