sisters yogita nandwana , five , and anisha , three , and 18-month-old brother harsh , are among the world 's heaviest young children .
now their father rameshbhai nandwana , 34 , of gurjarat , india , is planning to sell his kidney to earn the money needed to see top specialists that he said ` when yogita was born she was extremely weak and weighed just 1.5 kg -lrb- 3.3 lbs -rrb- .