Jitteriness and poor feeding are common signs of hypoglycemia in a newborn.

Hypoglycemia is when the level of sugar (glucose) in the blood is too low.

Glucose is the main source of fuel for the brain and the body. In a newborn baby, low blood sugar can cause problems such as shakiness, blue tint to the skin, and breathing and feeding problems.

Choice A is wrong because hypertension and bradycardia are not typical symptoms of hypoglycemia in a newborn.

They may indicate other conditions such as heart problems or infection.

Choice B is wrong because diarrhea and vomiting are not specific symptoms of hypoglycemia in a newborn.

They may be caused by many other factors such as infection, food intolerance, or gastroesophageal reflux.

Choice D is wrong because hyperactivity and irritability are not usual symptoms of hypoglycemia in a newborn.

They may be signs of other conditions such as pain, hunger, or overstimulation.

Normal ranges for blood glucose levels in newborns vary depending on the age, gestational age, and feeding status of the baby. Most doctors consider blood glucose that is below 47 milligrams per deciliter (mg/dl) to be the definition of hypoglycemia in newborns.

However, some babies may need higher levels to prevent brain injury.

A doctor will monitor the blood glucose levels of a newborn at risk for hypoglycemia and treat accordingly.