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What is the "congratulations" etiquette for premature babies? - etiquette baby congratulations

I have a friend who is just two daughters prematurely. 1 kg 13 grams and the other 1 pound 9 1/4oz. You are on oxygen to breathe, but her own. My husband and I want to call or send flowers, a few, but we're not quite sure what to say. "Congratulations" seems to be insensitive to the gravity of the situation of girls, but "we are here if you are a little" too similar to the sympathy that we send their way. Any suggestions welcome.