Child Development Specialist
A child development specialist is trained in infant and toddler development through the educational department of a college. This professional often works in school settings as well as in childcare and parenting settings. Child development specialists receive either a two-year or four-year degree in child development or human development.
Infant-family mental heath practitioners, or early interventionists, on the other hand, are either special education teachers, licensed mental health clinicians such as marriage and family therapists (also called psychotherapists), clinical psychologists, school psychologists, neuropsychologist, and developmental pediatricians or they're licensed physical therapists, occupational therapists, music or movement therapists and speech/language therapists. A parent would seek out one or more of these professionals depending upon the particular difficulties that the child and the family might be experiencing.
See also:
Neuropsychologist
Marriage and Family Therapist
Developmental Pediatrician
Movement Therapist
Physical Therapist
School Psychologist
Occupational Therapist