

When a person publicizes his blessings and arouses the envious notice of others, it invokes the attention of the Heavenly court as well. The reason for this is presumably ayin hara – “evil eye” – a concern that drawing too much attention to one’s blessings will elicit the jealous stares of others. Many have a practice not to tell anyone till the end of the first trimester – when the mother-to-be is beginning to show.
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There are no specific laws and customs in Jewish law for not announcing a pregnancy. Is there any such requirement in Jewish law? The Aish Rabbi Replies

However, I know people often wait a few months first. As an only child, I am anxious to tell my parents of the upcoming good news. I just found out recently that I am expecting.
