Doxycycline is a semi-synthetic tetracycline antibiotic prescribed to treat various bacterial infections such as urinary tract and bladder infections. Veterinarians also use Doxycycline to treat some diseases such as Rocky Mountain Spotted Fever and Lyme disease.
Habituation is actually a good thing; it indicates that the child is learning. For example, when there's a loud noise, Parker is startled and looks at whatever makes the noise. He is scared that the loud noise might mean danger.
A habit is a learned behavior that a person repeats so often that he or she begins to do it without even thinking about it. Certain habits can be helpful, like the habit of brushing your teeth before going to bed or buckling your seatbelt when you get into a car.