This is a medical question of type : symptoms 
 What are the symptoms of Cri du chat syndrome ? 
 What are the signs and symptoms of Cri du chat syndrome? The Human Phenotype Ontology provides the following list of signs and symptoms for Cri du chat syndrome. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Dictionary to look up the definitions for these medical terms. Signs and Symptoms Approximate number of patients (when available) Abnormality of chromosome segregation 90% Abnormality of the voice 90% Cognitive impairment 90% Epicanthus 90% Low-set, posteriorly rotated ears 90% Microcephaly 90% Muscular hypotonia 90% Round face 90% Wide nasal bridge 90% Abnormality of the palate 50% Hypertelorism 50% Intrauterine growth retardation 50% Scoliosis 50% Short neck 50% Short palm 50% Short stature 50% Abnormality of bone mineral density 7.5% Finger syndactyly 7.5% Hernia of the abdominal wall 7.5% Joint hypermobility 7.5% Preauricular skin tag 7.5% Recurrent fractures 7.5% Abnormality of cardiovascular system morphology - Abnormality of the kidney - Abnormality of the pinna - Aggressive behavior - Anterior open-bite malocclusion - Anxiety - Autism - Bifid uvula - Cat cry - Cataract - Conspicuously happy disposition - Cryptorchidism - Delayed speech and language development - Diastasis recti - Difficulty walking - Downturned corners of mouth - Echolalia - Facial asymmetry - Facial grimacing - Feeding difficulties in infancy - Functional respiratory abnormality - Gastroesophageal reflux - Growth delay - Hearing impairment - High axial triradius - High palate - Hyperactivity - Hyperacusis - Hypertonia - Hypospadias - Inguinal hernia - Intellectual disability - Long face - Low-set ears - Microretrognathia - Myopia - Narrow face - Neonatal hypotonia - Oppositional defiant disorder - Optic atrophy - Oral cleft - Overfriendliness - Pes planus - Premature graying of hair - Prominent supraorbital ridges - Recurrent infections in infancy and early childhood - Self-mutilation - Short attention span - Short metacarpal - Short metatarsal - Short philtrum - Single transverse palmar crease - Small for gestational age - Sporadic - Stenosis of the external auditory canal - Stereotypic behavior - Strabismus - Syndactyly - Thick lower lip vermilion - The Human Phenotype Ontology (HPO) has collected information on how often a sign or symptom occurs in a condition. Much of this information comes from Orphanet, a European rare disease database. The frequency of a sign or symptom is usually listed as a rough estimate of the percentage of patients who have that feature. The frequency may also be listed as a fraction. The first number of the fraction is how many people had the symptom, and the second number is the total number of people who were examined in one study. For example, a frequency of 25/25 means that in a study of 25 people all patients were found to have that symptom. Because these frequencies are based on a specific study, the fractions may be different if another group of patients are examined. Sometimes, no information on frequency is available. In these cases, the sign or symptom may be rare or common.