This section on puberty and growth is led by Great Ormond Street Hospital, Consultant Paediatric Endocrinologist, Dr Rakesh Amin. He explains that starting puberty at an unexpected age can be concerning for parents and children, and is almost always linked to the behaviour of hormones. Any parent who is at all concerned about their child's growth or puberty can find further information in the articles below and should seek the advice of a GP.