what is the words which i can say to congratulate a Pregnant woman for her pregnancy?

Once I wished to an american friend for his woman's preganancy saying: "I wish your children (twins) will grow up in a heavenly culture". If i had to say that in greek it woul sound like:
"εύχομαι τα παιδιά σου να μεγαλώσουν σε μιά κοινωνία όπως αυτή των αγγέλων στον ουρανό"