ICU Means as Intensive Care Units where designed to cater to critically ill adults. NICU means as Neonatal Intensive Care Unit where designed to cater to critically ill where babies are born early, have health problems, or a difficult birth they go to the hospital's. Where is IVF stand for In vitro fertilization. IVF is a procedure where egg are removed from a woman's overy & combined with sperm outside the body to form embryos.