I'm not French but I understand French fairly well. French has two grammatical genders: male and female. So every noun is either male or female, and the corresponding male or female forms of the articles and pronouns must be used with them. There is no gender neutral 'it'. They were referring to 'the baby', 'le bébé' in French, and bébé is a male noun. The only grammatically correct way to refer to it was by using the male form of the article and pronouns.
Therefore I'd say that they didn't give away anything. Chances for a girl are still 50%.?