Need help

Hi so im posting on here for a friend who doesnt have this app but this couple is about to loose their minds, so i need some inspirational advice. My friend gave birth to her son at 23 weeks he was 1 lb 9oz this morning he had a lung collapse. Is this a common hiccup so to speak of this process of him growing to be full term size. Im just curious to know some of the that you guys have gone through with your premature babies