An infant should have doubled it's birth weight by the age of six months, and tripled it's birth weight by the age of 12 months. Children who fail to reach these markers may be underweight due to a variety of factors such as underfeeding, metabolic disorder, or failure to thrive.

All of the behaviors listed are part of the diagnostic criteria for autism spectrum disorder except for disruptive hyperactivity-impulsivity present for a period of greater than six months, which is part of the DSM-5's diagnostic criteria for attention deficit hyperactivity disorder (ADHD), not for autism spectrum disorder (ASD). 

Diminished level of consciousness, bradycardia, and fixed and dilated pupils are all signs of later-stage intracranial pressure (ICP). Dilated scalp veins may be present with ICP, but will be seen in the early stages of the condition. 

A parent of a child with a seizure disorder should be instructed to stay with the child through the duration of the seizure, to move any nearby furniture out of the way of the child to prevent trauma, and to note and record the length of the seizure. No object should ever be put into the mouth of a child who is having a seizure.

Strabismus is a misalignment of the eyes that results in one eye becoming dominant over the other. It does not affect hearing or ability to connect to others socially. This condition should not result in nausea.

Babies and toddlers should not fall asleep with bottles full of milk or juice with them at bedtime. Plain water would be acceptable for a child to have at bedtime, as it does not have any sugar. The sugar in milk and juice will remain in the child’s mouth during sleep and cause caries, even if the teeth are not fully formed. It is common for babies to lose interest in bottles at night time when water is substituted.

Toilet training may be achieved anywhere from 24 months to 36 months, and may sometimes take longer for boys than girls. Bladder control usually occurs after bowel control. Parents should not be concerned if their children take the full 36 months to become toilet trained or if they have difficulty holding their urine longer than a few hours due to the small size of their bladders. Toilet training that takes longer than 3 years may be caused by psychological factors, but this child is not in need of the assessment of a child psychologist at his age. The nurse should not encourage the mother to tell the child that his behavior is unacceptable because it is not expected of him to achieve full toilet training for another year.

An infant begins to show signs of anxiety toward strangers between 8 and 12 months of age and may recur until two years of age. This anxiety can show as silence, staring, writhing or crying in the presence of people they don't know. 

The grasping reflex is the earliest reflex developed by the infant. It is often present at birth: the infant will grasp at objects such as a finger placed into their open palm.  

The inferior pincer grasp is the ability to pick up small objects such as by resting the forearm on a surface and pinching using the sides of the thumb and the index finger. It is an important milestone in the development of fine motor skills.