Synonyms for Crybaby (same or very similar meaning)
WordNet sense 1 (a person who lacks confidence, is irresolute and wishy-washy):
chickenWordNet sense 2 (a person given to excessive complaints and crying and whining):
complainer, grumbler, moaner, squawker, whiner, bellyacher, snivellerFrom the ODE community, based on WordNetadd/edit