Halflings are a people without a home. They wander through the kingdoms of taller races, never staying to long in one location, always searching for a place to make their own.
In this culture it is not wise to talk too much good things about anything - especially children,lest some evil spirit steals it. So it is customary to say it is ugly and weak and will surely not survive. Also:
"The man who boasts of his young woman is a fool,
The man who boasts of his wares will get rich."