It is customary to bless the newborn with the traditional blessing with which the Kohanim [priests] generally bless the congregation. A Kohen may recite this blessing, as may the parents, grandparents, or anyone else. The original form of this blessing is generally recited (as it appears in Numbers 6:24), preferably the expanded version that follows. Some people entirely preserve the verse in its original form, while others change it to the feminine form.
Yishmirech Elohim ki-Sarah, Rivkah, Rachel vi-Leah asher banu et Beit Yisrael,
Yivarechichech/yivarechicha Adonai vi-yishmirech/yishmirecha,
Ya’er Adonai panav elayich/elecha vi-yasim lach/licha shalom.
Viyihi ratzon milifnei Avinu Shebashamayim, sheyiten bi-libech ahavato vi-yirato,
Vitihiyeh yirat HaShem al p’nayich kol yamayich she-lo techeta’i u-tihiyeh cheshkech
Eynayich li-nochach yabitu, pich yidaber chochmot, vi-libech yehigeh aymot,
yadayich ya’asku bi-mitzvot, raglayich yarutzu la’asot ritzon Avich sheh-bashamyim,
vi-yihi mikorech baruch.
Make God make you like Sarah, Rivkah, Rachel and Leah, the pillars of our people. May Hashem bless you and safeguard you. May Hashem illuminate His countenance for you and be gracious to you. May Hashem turn His countenance to you and establish peace for you. May it be the will of our Father in heaven, that He instill in your heart His love and reverence. May the fear of Hashem be upon your face all your days, in order that you not sin. May your craving be for the Torah and the commandments. May your eyes gaze toward truth, may your mouth speak wisdom, may your hands engage in the commandments, may your feet run to do the will of your Father in heaven. May the source of your posterity be blessed.