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.
(Examples of associative learning include classical conditioning and operant conditioning). Habituation is the decrease of a response to a repeated eliciting stimulus that is not due to sensory adaption or motor fatigue.