<prompt> Legal age by w hich fetus is capable of independent existence is -240 days230 days220 days210 days  <response>: Ans. is d i.e., 210 days o Viability means the physical ability of a foetus to lead a separate existence after birth apart from its mother, by virtue of a certain degree of development. A child is viable after 210 days 7 months of intrauterine life, and in some cases after 180 days 6 months but in most of these cases fetus is immature.o Full term mature infant show :-Length crow n-heel length 48-52 cm, head circumference 30-35 cm.Ossification center at lower end of femur appears at the end of 9 months or just before birth and Ossification center ofcuboid and upper tibia may also present Note : some ossification centers are also present, but they appear before the attainment of viability so their presence does not have importance. These are i Clavicle, mandible, ribs vertebra - at the end of 2nd month, ii Calcaneumos calcis and manubrium sterni - at the end of 5th month and iii Sternum - at the end of 6 month. Other center which appears at attainment of viability is primary ossificaion center of talus which appears at the end of 7th month. 