What are the signs and symptoms of Neonatal progeroid syndrome? The signs and symptoms of neonatal progeroid syndrome vary but may include: Subcutaneous lipoatrophy (deficiency or absence of the fat layer beneath the skin) which gives infants an aged appearance at birth Intrauterine growth restriction Failure to thrive Feeding difficulties Distinctive craniofacial features such as a triangular face; large skull with wide anterior (front) fontanelle; small, underdeveloped facial bones; natal teeth; low-set, posteriorly (towards the back) rotated ears, ectropion; and/or unusually sparse scalp hair, eyebrows, and eyelashes Thin arms and legs with disproportionately large hands and feet Small fingers and toes with underdeveloped nails Osteopenia (low bone density) Horizontal nystagmus Developmental delay Mild to severe intellectual disability The Human Phenotype Ontology provides the following list of signs and symptoms for Neonatal progeroid 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) Abnormal hair quantity 90% Abnormality of the eyelashes 90% Abnormality of the fontanelles or cranial sutures 90% Abnormality of the hip bone 90% Aplasia/Hypoplasia of the eyebrow 90% Arachnodactyly 90% Cognitive impairment 90% Delayed skeletal maturation 90% Frontal bossing 90% Hearing impairment 90% High forehead 90% Intrauterine growth retardation 90% Laryngomalacia 90% Lipoatrophy 90% Macrocephaly 90% Narrow mouth 90% Short stature 90% Thin skin 90% Triangular face 90% Advanced eruption of teeth 50% Cerebral cortical atrophy 50% Convex nasal ridge 50% Cryptorchidism 50% Ventriculomegaly 50% Abnormality of chromosome stability 7.5% Limitation of joint mobility 7.5% Long penis 7.5% Flexion contracture 5% Hypertriglyceridemia 5% Hypospadias 5% Abnormality of cardiovascular system morphology - Absence of subcutaneous fat - Aplasia/Hypoplasia of the earlobes - Autosomal recessive inheritance - Blue sclerae - Congenital onset - Decreased subcutaneous fat - Delayed closure of the anterior fontanelle - Dysphagia - Ectropion - Entropion - Failure to thrive - Feeding difficulties - Gynecomastia - Hypertelorism - Hypoplastic ilia - Hypotrichosis - Increased serum testosterone level - Intellectual disability - Intention tremor - Large hands - Long fingers - Long foot - Long toe - Low-set ears - Malar flattening - Muscular hypotonia - Narrow nasal ridge - Natal tooth - Nystagmus - Parietal bossing - Prominent scalp veins - Recurrent respiratory infections - Short femur - Short humerus - Small nail - Sparse eyebrow - Sparse eyelashes - Sparse scalp hair - Sudanophilic leukodystrophy - Thin ribs - Truncal ataxia - Upslanted palpebral fissure - Widely patent fontanelles and sutures - 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.