A one-year-old child’s ribs sticking outward, also known as rib ectropion, may be related to congenital developmental malformations, or it may be caused by trauma or rickets and other reasons. 1. Congenital developmental deformities: some children may be affected by certain adverse factors, such as genetic inheritance, chromosomal aberrations, environmental influences during pregnancy and other factors, which may lead to congenital developmental deformities, thus showing rib ectropion. 2. Trauma: One year old children due to accidental car accident injuries, fall from height injuries and other traumatic factors, may cause rib ectropion. Consider that it may be caused by the direct action of external force. 3. Rickets: some one year old children due to failure to reasonably supplement calcium and vitamin D, it is likely to induce rickets, it may cause rib ectropion, may also be accompanied by head sweating, easy to wake up at night, occipital baldness and other symptoms. A one-year-old child’s ribs outward may also be other reasons, it is recommended to take the child to the doctor as soon as possible, after the causative factors are clarified, by the doctor’s guidance for treatment.