<prompt> Cause of repeated 2nd trimester foetal loss:Chromosomal anomalyIntrauterine infectionAbnormality of cervix and uterusHormonal imbalance  <response>: Common known causes of abortion:First trimester: defective germ plasm, hormonal deficiency, trauma, acute infection.Mid trimester: Cervical incompetence, uterine malformations, uterine fibroid, low implantation of placenta, twins and hydramnios 