16p13.11 microdeletion syndrome is a recently described syndrome characterized by developmental delay, microcephaly, epilepsy, short stature, facial dysmorphism and behavioral problems. People with a 16p13.11 microdeletion have one intact chromosome
16, but the other is missing a tiny piece from the short arm. Some people with a 16p13.11 microdeletion seem unaffected by it. Others have some problems with their
development (delay in learning to sit, move and walk), speech (delay in starting to speak and language development), behavior, learning or health that may be caused by the missing genetic material, increased risk of developing seizures, microcephaly (a small head). There is a lot of variation between different members of the same family
who have the same microdeletion - if one person is mildly affected or unaffected, others may be more severely and obviously affected.