USG Obs & Gyne
-Gestational sac is earliest recognized at	5 weeks (32 days by transvaginal sonography)
-Foetal node is earliest recognized at	6 weeks.
-Foetal heart motion is earliest recognized at	6-7 weeks
-Foetal movements are earliest recognised at	8-9 weeks
-Placental implantation is earliest recognized at	8-9 weeks
-Fetal breathing movements are earliest recognized at	11 weeks
-Fetal spine can be recognized earliest at	12 weeks
-Fetal stomach. Kidneys. UB & Cardiac anatomy can   be earliest recognized at	16 weeks
-Fetal genitalia are earliest recognized at	14 weeks
-Epiphysis of distal end of femur can be earliest recognized at	32 weeks