Safety and PK-PD Study of Oral L-CIT in Preterm Infants with BPD±PH and NEC

This study tests an oral form of L-citrulline (a natural amino acid) in premature babies who have a serious lung condition called bronchopulmonary dysplasia (BPD), sometimes with high blood pressure in the lungs. It also includes babies with a serious gut condition called NEC (necrotizing enterocolitis). The goal is to assess safety and how the drug is processed in very small, fragile patients. **You may be eligible if...** - Your baby was born at 30 weeks or earlier - Your baby is now at a post-menstrual age of at least 34 weeks - Your baby has bronchopulmonary dysplasia (with or without high blood pressure in the lungs) or necrotizing enterocolitis - Your baby is still on breathing support **You may NOT be eligible if...** - Your baby has a congenital heart defect (with limited exceptions) - Your baby has other conditions making the study too risky Talk to your doctor to see if this trial is right for you.