− | Newborn foals. More common in colts than fillies, particularly if they are overdue. This may be related to a narrower pelvic inlet. | + | Newborn foals. More common in colts than fillies, particularly if they are overdue. This may be related to a narrower pelvic inlet in colts.<ref>Martens, R.J (1982) Pediatrics. In: Equine Medicine and Surgery, 3rd edn., Eds: R.L. Mannsman and E.S. McAllister, American Veterinary Publications, Santa Barbara. pp 333-334. In: </ref> |