Dr Olga Kapellou is a consultant paediatrician and neonatologist based at Homerton Hospital. She also runs general paediatric clinics and baby follow up clinics at the Portland Hospital, Harley Street and The Hospital of St John & St Elizabeth. Dr Kapellou offers her patients baby checks, help with feeding problems, colic, excessive crying, food aversion, food allergy, breathing problems, constipation, diarrhoea, and frequent infections. In outpatient clinics, she uses Griffiths Neurodevelopmental Scales to track infant development. She is also a Neonatal Life Support instructor and a breastfeeding specialist (certified by Unicef).

Dr Kapellou trained at a number of major London hospitals including Great Ormond Street and University College London. She has particular expertise in preterm and term neonatal brain injury as well follow-up of babies after complicated pregnancies and births. Following her qualification in 1995, she went on to conduct research on the impact of preterm on brain growth and development, and her work has been widely cited since.

In 2009, Dr Kapellou was appointed consultant at Homerton Hospital, and she began working at the Hospital of St John and St Elizabeth in 2010. She later began working at the Portland Hospital for Women and Children. Dr Kapellou is a fellow of the Royal College of Paediatrics and Child Health.