Oral habits are repeated patterns of behavior done in the oral cavity. It includes digit sucking, lip sucking, tongue thrusting, nail-biting, and bruxism. The consequences of oral habits on the oral cavity are ulcers, malocclusion, periodontal diseases, dental caries, otitis media, and sleep problems.
Thumb or Digit Sucking
Thumb or digit sucking is the most common oral habit among children. If this continues after 3 to 4 years of age, then it can result in harmful effects on the teeth and jaws.
Tongue Thrust
The habit of placing the tongue forward between the upper and lower anterior or posterior teeth while swallowing is called tongue thrust.

Oral Health Care for Expecting Mothers and Infants
Maintaining oral health is an important component of overall health in pregnant women and infants. The below article details the same.