An orphan disease is defined as a condition that affects fewer than 200,000 people nationwide. This includes diseases as familiar as cystic fibrosis, Lou Gehrig's disease, and Tourette's syndrome, and as unfamiliar as Hamburger disease, Job syndrome, and acromegaly, or gigantism..
Mozart started composing at age 3. In psychology research literature, the term child prodigy is defined as person under the age of ten who produces meaningful output in some domain to the level of an adult expert performer. Child prodigies are rare, and in some domains there are no child prodigies at all.n psychology research literature, the term child prodigy is defined as person under the age of ten who produces meaningful output in some domain to the level of an adult expert performer.
Merriam-Webster dictionary simply says a newborn is a baby who is recently born and does not put an upper limit to the term. The dictionary also defines an infant as a child in the first stage of life but doesn't give any age specifics. The World Health Organization (WHO) defines a newborn, or neonate, as a baby under 28 days old. As the name implies, a toddler is classically defined as a child who is just learning to walk or one who toddles. This is often around one year of age. There's no official definition of the upper limit of toddlerhood.