Common Abbreviations

ABG - Arterial blood gas
ABO - Blood groups
APH - Antipartum Haemorrhage
BCG - Bacillus Calmette Guerin
Bili - Bilirubin. It is a yellow discolouration of the skin and sclera, caused by a breakdown of old red blood cells that cannot be removed quick enough by the liver.
BLISS -  The National Charity For The Newborn
BP - Blood Pressure
BW - Birth Weight
CLD - Chronic Lung Disease
CMV - Continuous Mandatory Ventilation (predetermined pattern breaths on a ventilator)
CNS - Central Nervous System
CO2 - Carbon Dioxide
CPAP - Continuous Positive Airway Pressure (air or oxygen delivered under pressure)
CPR - Cardiopulmonary Resuscitation
CRP - C-Reactive Protein
CSF - Cerebral Spinal Fluid
EBM - Expressed Breast Milk
ET tube - Endotracheal tube.
FBC - Full Blood Count
FiO2 - Fractional Inspired Oxygen
G - Grams
Hb - Haemoglobin
Hep B - Hepatitis B
HFOV - High Frequency Oscillating Ventilation. A mode of ventilation that gives continual gentle vibrations to the lungs
HIB - Haemophilus Vaccine
HIV - Human Immuno Deficiency Virus
ID - Identification 
IDM - Infant of a Diabetic Mother
IUGR - Intra Uterine Growth Restriction
IV - Intravenous
IVH - Intraventricular Haemorrhage
LP - Lumbar Puncture
Mec - Meconium (baby's first stool)
MRSA - Methicillin Resistant Staphylococcus Aureas
NEC - Necrotising Enterocolitis
NGT - Naso-gastric Tube
NICU - Neonatal Intensive Care Unit
NITRIC - Nitric Oxide
NBM - Nil by Mouth
O2 - Oxygen
OBS - Observations
OGT - Oro-gastric Tube
PDA - Patent Ductus Arteriosus
PKU - Phenylketonuria
PRN - As necessary (abbreviated from latin)
RDS - Respiratory Distress Syndrome
ROP - Retinopathy of Prematurity
RSV - Respiratory Syncytial Virus
SANDS - Stillbirth and Neonatal Death Society (a national support group)
SaO2 - Saturated Oxygen
SBR - Serum Bilirubin
SIDS - Sudden Infant Death Syndrome
SIMV - Synchronised Intermittent Mandatory Ventilation (predetermined pattern breaths on ventilator timed with baby's spontaneous breathing)
TPN - Total Parenteral Nutrition - feeding via a drip
TTN - Transient Tachypnoea of the Newborn
U&Es - Urea and Electrolytes
UAC - Umbilical Arterial Catheter
UVC - Umbilical Venous Catheter