FETAL DEVELOPMENT

2 TO 3 WEEK	5 WEEK	8 WEEK
*1.5 to 2 mm length *tubular shape of heart * circulation start, lung bud's appear, neral plate change into bain & card.	⦁ 4 to 6 mm length ⦁ weight .4 gm ⦁ visible double heart chamber(beat start)	⦁ 3 cm length  ⦁ 2 gm weight ⦁ Eye lid fusion stsrt ⦁ every organ system present[Embryo]
12 W	16W	20 W
⦁ 6 to 9 cm length  ⦁ 19 gm weight ⦁ sex  recognization ⦁ heart beat detected by doppler transducers kidneys begin to from urine.	⦁ 11.5 to 13.5 ⦁ 100gm ⦁ skelton ossification ⦁ laungos start to develop(fetal hair follicles) ⦁ active fetal movement present.	⦁ 16 to 18.5 cm  ⦁ 300 gm ⦁ muscles nail laungos develop cover body ⦁ heart beat detect by fetoscope / stethoscope.
24 W	28 W	32 W
⦁ 23cm long ⦁ 600 gm ⦁ ability to hear ⦁ hand grasp fuction ⦁ lanugos over head ⦁ vernix caseasa cover ⦁ entire body -(waxy or cheese like white sutstance found the skin.	⦁ 27 cm long ⦁ 1100 gm ⦁ eye lid open and close ⦁ lecithin development in lungs so ready for gas exchange  ⦁ brain develop ripidly.	⦁ 31cm long ⦁ 1800-2100 gm ⦁ bone full develop ⦁ sub cutaneous fat (L/S  1.2:1 )
36 w	40 w
⦁ 35cm long  ⦁ 2200-2900 gm ⦁ skin pink/less wrinkled) ⦁ lanugos disappear(l/s=2:1)	⦁ 40-45 cm ⦁ weight-3200gm ⦁ testes in scrotum ⦁ fingernail extends fingertips ⦁ labia majasra well develop ⦁ skin pinkish and smooth