An overview of the first three years of each child's life.
Hamish has achondroplasia, or dwarfism, and as his restricted height becomes more obvious, his parents learn about leg-lengthening surgery.
Shelbie has spent most of her life in hospital due to a rare chromosome disorder called Partial Trisomy 9P and her mum Vicky has had to come to terms with the fact that she is likely to outlive her daughter.
William's genetic condition, Tuberous sclerosis, is causing him to suffer regular seizures and he undergoes surgery in attempt to ease his symptoms.
Emily's Spina bifida, though relatively mild, means that she is six months behind in her physical development and still in nappies.
Nathan has Down's syndrome, but is learning to communicate through sign language and speech.
Zoe's Arthrogryposis severely affects her ability to walk and use her arms and she faces gruelling surgery and physiotherapy.