The Rebbe blesses the newborn to grow in Torah, marriage, and good deeds, and wishes good news always. He thanks for sending books, advising to include also Nigleh and to look into those printed in Djerba, and concludes with blessings for the child, the mother’s recovery, and a good and sweet year.
https://www.torahrecordings.com/rebbe/004_igros_kodesh/elul/1167