A newborn may have a sac sticking out of the mid to lower back. The doctor cannot see through the sac when shining a light behind it. Symptoms include:

• Loss of bladder or bowel control
• Partial or complete lack of sensation
• Partial or complete paralysis of the legs
• Weakness of the hips, legs, or feet of a newborn

Other symptoms may include:

• Abnormal feet or legs, such as clubfoot
• Build up of fluid inside the skull (hydrocephalus)
• Hair at the back part of the pelvis called the sacral area
• Dimpling of the sacral area

Prenatal screening can help diagnose this condition. During the second trimester, pregnant women can have a blood test called the quadruple screen. This test screens for myelomeningocele, Down syndrome, and other congenital diseases in the baby. Most women carrying a baby with spina bifida will have a higher-than-normal levels of a protein called maternal alpha fetoprotein (AFP).

If the quadruple screen test is positive, further testing is needed to confirm the diagnosis. Such tests may include:

• Pregnancy ultrasound
• Amniocentesis

Myelomeningocele can be seen after the child is born. A neurologic examination may show that the child has loss of nerve-related functions below the defect. For example, watching how the infant responds to pinpricks at various locations may reveal where he or she can feel the sensations.

Tests done on the baby after birth may include x-rays, ultrasound, CT, or MRI of the spinal area.